Fusarium Photobiology: Comparison
Please note this is a comparison between Version 2 by Jessie Wu and Version 1 by Javier Avalos.

The genus Fusarium comprises a large and heterogeneous group of ascomycetes widely distributed in nature. Many of them have received attention as phytopathogens, with great impacts on crops and as mycotoxin producers, but others are non-pathogenic, endophytic, saprophytic, or parasitic species of other organisms. The global distribution of the genus is attributed both to its metabolic diversity, which broadens its accessibility to very diverse potential substrates, and to its efficient dispersal mechanism, which is based on the production of different types of conidia. The complex taxonomy of Fusarium species has been clarified by DNA-based phylogenetic analyses, which revealed a monophyletic lineage consisting of 20 species complexes including almost 300 phylogenetically distinct species. Different species of the Fusarium genus are widely used in research, e.g., Fusarium graminearum, Fusarium oxysporum, and Fusarium fujikuroi, which are normally associated with pathogenesis or secondary metabolism. Some features of the biology of these species, especially those related to development and metabolite production, are influenced by light. 

  • light
  • Fusarium
  • RNA

1. Effects of Light on Development

The developmental processes related to asexual reproduction in Fusarium are influenced by different factors and environmental cues, including light [19][1]. Fungi of this species spread asexually through the formation of three types of spores, macroconidia, microconidia, and chlamydospores [16][2]. The different kinds of spores share common characteristics in different Fusarium species, but there is considerable morphological diversity [20,21][3][4]. Macroconidia are long, typically sickle-shaped, with transverse septa, usually containing several cells [19][1]. Microconidia are usually unicellular, although they are not produced by all Fusarium species, and a few species can arrange microconidia in chains [16][2]. Chlamydospores are thick-walled cells, usually formed inside the hyphae, capable of surviving in adverse conditions and for long periods of time [22][5]. Conidia of either type are usually produced in abundance to promote rapid dispersal and the colonization of new habitats, including other pathogenic hosts. Due to their multinucleated nature, it can be expected that the macroconidia are more resistant than the microconidia to adverse conditions, and it has been reported that they can develop chlamydospores [23][6].
Visible and near-UV lights have been reported to enhance conidia production in different Fusarium species [24][7]. Thus, in Fusarium verticillioides, short-wavelength blue light is particularly effective in stimulating conidia production [25][8]. Conidiation levels and the presence of macroconidia are very variable among different F. fujikuroi strains [26][9]. Macroconidia are rarely observed in IMI58289, a widely used wild-type strain, but they are frequently found in FKMC1995, which has been used in different works described in this revisewarch. Regulatory differences are also observed between both strains. For example, light induces conidiation in IMI58289 [24,26][7][9] although it has a negative effect in FKMC1995 [27][10]. The differential fitness of conidia produced at different wavelengths towards light has also been described [27][10].
In F. graminearum, conidiation under near-UV light requires the abaA gene product [28][11] conserved in other fungi. The induction of conidiation by light in F. fujikuroi IMI58289 does not occur in mutants of the GATA factor Csm1 [29][12]. The latter, and other proteins, such as histone methyltransferase Set1 and demethylase Kdm5, control the expression of the key conidiation regulator gene abaA [30][13]. In this research, conidiation was tested under illumination regimes, but the effect of light was not investigated. The elimination of Fvve1 in F. verticillioides alters the aerial development of the hyphae and reduces their hydrophobicity, and in submerged cultures it activates conidiation. Interestingly, this mutation increases the ratio of macroconidia to microconidia [31][14]. The relationship of this protein with light regulation (see Section 2.2)  provides a possible explanation for the influence of light on conidiation. The possible involvement of photoreceptors in conidiation, investigated through the effect of their gene mutations, is mentioned in Section 4, Section 5, Section 6 and Section 7.
Regulation by light also involves sexual reproduction. In sexually competent species, the formation of perithecia during mating is favored under specific light conditions. This has been investigated in F. graminearum [32[15][16],33], in which the perithecia are not formed in the dark but under light, with 4 h of daily light being enough for their optimal production. Moreover, reducing UV exposure lowers the number of perithecia. Ascospore release is also stimulated by light in this fungus [34][17].

2. Effect of Light on Carotenogenesis

Photocarotenogenesis is the most well-characterized light-regulated process in Fusarium [35][18]. The first studies on the effect of light on carotenogenesis were carried out on Fusarium aquaeductuum, which showed a gradual accumulation of carotenoids after illumination, reaching a maximum at 12 h [36][19]. The carotenogenetic reaction to light in this species is independent of temperature in the range of 5 to 25 °C but requires oxygenation and active protein synthesis [37][20]. The light-inducing effect can be partially replaced by the addition of oxidizing reagents [36[19][21],38], suggesting that the oxidation of the -SH groups plays a role in the light sensing system, which disappears when reducing agents are added [39][22]. However, while brief exposure to light is sufficient for photoinduction, oxidizing agents must be continuously present to maintain their stimulatory effect in addition to that of light [40][23], indicating different mechanisms of action. Nevertheless, the oxidizing agent p-hydroxymercuribenzoate had no effect on other Fusarium species [41][24].
All Fusarium carotenoid synthesis genes have been identified [35][18], and the pathway is well established. Three structural genes, carRA, carB, and carX, required for torulene, β-carotene, and retinal production, are organized in a gene cluster coregulated with a rhodopsin gene, carO. The photoinduction of carotenogenesis in Fusarium mycelium grown in the dark involves a rapid increase in the transcript levels of most structural genes during the first hour of illumination, followed by an accumulation of carotenoids in the following hours, providing an orange pigmentation to the mycelium. Northern blot and RT-PCR analyses of the four clustered car genes of F. fujikuroi showed a similar induction kinetics, also found for the carT gene, which is required for neurosporaxanthin synthesis. Similar results were obtained in F. oxysporum [42][25] and F. verticillioides [43,44][26][27]. Recent RNA-seq data have also revealed the significant photoinduction of ggs1 coding for a prenyl transferase [6][28], which has been previously underestimated [45][29]. The carD gene exhibited a lower photoresponse in F. fujikuroi [46][30], as corroborated by RNA-seq data [35][18]. Therefore, in F. fujikuroi, all carotenoid metabolism genes are regulated by light. The regulatory proteins responsible for this photoresponse are mentioned in later sections, but other proteins involved in the light signal transduction pathway may also be responsible. Fusarium has the predicted components of a Velvet complex, FfLae1, FfVel, and FfVel2 [47][31], which is connected to light regulation in other fungi [48][32]. The carRA gene is upregulated in Fflae1 mutants, indicating a repressor function for lae1 gene [49][33].

3. Effect of Light on the Production of Other Secondary Metabolites

Light modulates the production of other metabolites in addition to carotenoids. Gibberellin biosynthesis is stimulated by light in some strains of F. fujikuroi [24[7][34],51], although its effect is minor compared to that caused by nitrogen shortage. The influence of light on the synthesis of enniatins, cyclohexadepsipeptide antibiotics produced by different Fusarium species, has also been investigated. Enniatin production is enhanced by light in Fusarium sambucinum [52][35]. In other fungi, such as those of the genera Aspergillus or Neurospora, light influences the production of secondary metabolites through the Velvet VelB/VeA/LaeA complex [47,53][31][36]. In Aspergillus, this occurs through light controlling the VeA passage into the nucleus in response to a signal from photoreceptor proteins [54][37]. In Neurospora crassa, light promotes the degradation of the Velvet Ve-1 protein [55][38]. Disruption of the Velvet complex genes in F. fujikuroi almost completely halts the biosynthesis of gibberellins, fumonisin, fusarins, and fusaric acid [48[32][33],49], as well as conidiation. F. graminearum deletion mutants of the FgVeA and FgVe1 genes show reduced aerial hyphal formation, as well as reduced biosynthesis of deoxynivalenol, aurofusarin, and trichotecene [56,57][39][40]. No attention has been paid, for either of the two Fusarium species, to the effect of light on these phenotypic changes. However, deleting the Velvet complex genes veA, velB, and laeA drastically reduces beauvericin production in F. oxysporum under light and dark conditions, in addition to affecting conidia production and morphology [58][41]. These mutants exhibited fewer differences in pigmentation and morphology between light and dark growth colonies than those exhibited by the wild type, confirming their connection to light regulation.

4. Fusarium Photoreceptors

The proteins responsible for light detection and signal transmission are known as photoreceptors. They bind to small molecules called chromophores, which can absorb light and cause a conformational or chemical change in the cognate protein. This triggers a direct response or initiates a signal transduction pathway [59][42]. Depending on the nature of their chromophore, photoreceptors can detect light or radiation within a specific wavelength range. Thus, UV-, blue/UV-, green-, or red-light photoreceptors can be distinguished. Flavin, retinal, and tetrapyrrole chromophores are the typical fungal photoreceptor chromophores [3][43]. Most light responses studied in fungi are caused by the detection of blue light, although responses at other wavelengths are also known [3,60,61,62][43][44][45][46]. The main families of photoreceptors in fungi and their presence in Fusarium are described below. Fusarium genomes contain genes for ten photoreceptors (Table 1). Most of them have been studied by targeted deletion in several Fusarium species, while others await investigation.

References

  1. Ajmal, M.; Hussain, A.; Ali, A.; Chen, H.; Lin, H. Strategies for Controlling the Sporulation in Fusarium Spp. J. Fungi 2022, 9, 10.
  2. Leslie, J.F.; Summerell, B.A. The Fusarium Laboratory Manual; Blackwell Professional: Ames, IA, USA, 2006; ISBN 0-8138-1919-9.
  3. Crous, P.W.; Lombard, L.; Sandoval-Denis, M.; Seifert, K.A.; Schroers, H.-J.; Chaverri, P.; Gené, J.; Guarro, J.; Hirooka, Y.; Bensch, K.; et al. Fusarium: More than a Node or a Foot-Shaped Basal Cell. Stud. Mycol. 2021, 98, 100116.
  4. Zemánková, M.; Lebeda, A. Fusarium Species, Their Taxonomy, Variability and Significance in Plant Pathology–a Review. Plant Protect. Sci. 2001, 37, 25–42.
  5. Gordon, T.R. Fusarium oxysporum and the Fusarium Wilt Syndrome. Annu. Rev. Phytopathol. 2017, 55, 23–39.
  6. Egel, D.S.; Martyn, R.D. Fusarium Wilt of Watermelon and Other Cucurbits. Plant Health Instructor 2007, 10, 1094.
  7. Avalos, J.; Estrada, A.F. Regulation by Light in Fusarium. Fungal Genet. Biol. 2010, 47, 930–938.
  8. Fanelli, F.; Schmidt-Heydt, M.; Haidukowski, M.; Susca, A.; Geisen, R.; Logrieco, A.; Mulè, G. Influence of Light on Growth, Conidiation and Fumonisin Production by Fusarium verticillioides. Fungal Biol. 2012, 116, 241–248.
  9. Niehaus, E.-M.; Kim, H.-K.; Münsterkötter, M.; Janevska, S.; Arndt, B.; Kalinina, S.A.; Houterman, P.M.; Ahn, I.-P.; Alberti, I.; Tonti, S.; et al. Comparative Genomics of Geographically Distant Fusarium fujikuroi Isolates Revealed Two Distinct Pathotypes Correlating with Secondary Metabolite Profiles. PLoS Pathog. 2017, 13, e1006670.
  10. Costa, T.P.C.; Rodrigues, E.M.; Dias, L.P.; Pupin, B.; Ferreira, P.C.; Rangel, D.E.N. Different Wavelengths of Visible Light Influence the Conidial Production and Tolerance to Ultra-Violet Radiation of the Plant Pathogens Colletotrichum acutatum and Fusarium fujikuroi. Eur. J. Plant Pathol. 2020, 159, 105–115.
  11. Son, H.; Kim, M.-G.; Min, K.; Seo, Y.-S.; Lim, J.Y.; Choi, G.J.; Kim, J.-C.; Chae, S.-K.; Lee, Y.-W. AbaA Regulates Conidiogenesis in the Ascomycete Fungus Fusarium graminearum. PLoS ONE 2013, 8, e72915.
  12. Niehaus, E.-M.; Schumacher, J.; Burkhardt, I.; Rabe, P.; Spitzer, E.; Münsterkötter, M.; Güldener, U.; Sieber, C.M.K.; Dickschat, J.S.; Tudzynski, B. The GATA-Type Transcription Factor Csm1 Regulates Conidiation and Secondary Metabolism in Fusarium fujikuroi. Front. Microbiol. 2017, 8, 1175.
  13. Janevska, S.; Güldener, U.; Sulyok, M.; Tudzynski, B.; Studt, L. Set1 and Kdm5 Are Antagonists for H3K4 Methylation and Regulators of the Major Conidiation-Specific Transcription Factor Gene ABA1 in Fusarium fujikuroi. Environ. Microbiol. 2018, 20, 3343–3362.
  14. Li, S.; Myung, K.; Guse, D.; Donkin, B.; Proctor, R.H.; Grayburn, W.S.; Calvo, A.M. FvVE1 Regulates Filamentous Growth, the Ratio of Microconidia to Macroconidia and Cell Wall Formation in Fusarium verticillioides. Mol. Microbiol. 2006, 62, 1418–1432.
  15. Kim, H.; Kim, H.-K.; Lee, S.; Yun, S.-H. The White Collar Complex Is Involved in Sexual Development of Fusarium graminearum. PLoS ONE 2015, 10, e0120293.
  16. Tschanz, A.T.; Horst, R.K.; Nelson, P.E. The Effect of Environment on Sexual Reproduction of Gibberella zeae. Mycologia 1976, 68, 327.
  17. Trail, F.; Xu, H.; Loranger, R.; Gadoury, D. Physiological and Environmental Aspects of Ascospore Discharge in Gibberella zeae (Anamorph Fusarium graminearum). Mycologia 2002, 94, 181–189.
  18. Avalos, J.; Pardo-Medina, J.; Parra-Rivero, O.; Ruger-Herreros, M.; Rodríguez-Ortiz, R.; Hornero-Méndez, D.; Limón, M. Carotenoid Biosynthesis in Fusarium. J. Fungi 2017, 3, 39.
  19. Rau, W. Untersuchungen Über Die Lichtabhängige Carotinoidsynthese: II. Ersatz Der Lichtinduktion Durch Mercuribenzoat. Planta 1967, 74, 263–277.
  20. Rau, W. Untersuchungen über die lichtabhängige Carotinoidsynthese. VII. Reversible Unterbrechung der Reaktionskette durch Cycloheximid und Anaerobe Bedingungen. Planta 1971, 101, 251–264.
  21. Rau, W.; Feuser, B.; Rau-Hund, A. Substitution of P-Chloro- or p-Hydroxymercuribenzoate for Light in Carotenoid Synthesis by Fusarium aquaeductuum. Biochim. Biophys. Acta 1967, 136, 589–590.
  22. Theimer, R.R.; Rau, W. Untersuchungen über die Lichtabhängige Carotinoidsynthese V. Aufhebung der Lichtinduktion Dutch Reduktionsmittel und Ersatz des Lichts Durch Wasserstoffperoxid. Planta 1970, 92, 129–137.
  23. Theimer, R.R.; Rau, W. Untersuchungen über die lichtabhängige Carotinoidsynthese. VIII. Die unterschiedlichen Wirkungsmechanismen von Licht und Mercuribenzoat. Planta 1972, 106, 331–343.
  24. Ávalos, J.; Cerdá-Olmedo, E. Chemical Modification of Carotenogenesis in Gibberella fujikuroi. Phytochemistry 1986, 25, 1837–1841.
  25. Rodríguez-Ortiz, R.; Michielse, C.; Rep, M.; Limón, M.C.; Avalos, J. Genetic Basis of Carotenoid Overproduction in Fusarium oxysporum. Fungal Genet. Biol. 2012, 49, 684–696.
  26. Adám, A.L.; García-Martínez, J.; Szucs, E.P.; Avalos, J.; Hornok, L. The MAT1-2-1 Mating-Type Gene Upregulates Photo-Inducible Carotenoid Biosynthesis in Fusarium verticillioides. FEMS Microbiol. Lett. 2011, 318, 76–83.
  27. Díaz-Sánchez, V.; Limón, M.C.; Schaub, P.; Al-Babili, S.; Avalos, J. A RALDH-like Enzyme Involved in Fusarium verticillioides Development. Fungal Genet. Biol. 2016, 86, 20–32.
  28. Ruger-Herreros, M.; Parra-Rivero, O.; Pardo-Medina, J.; Romero-Campero, F.J.; Limón, M.C.; Avalos, J. Comparative Transcriptomic Analysis Unveils Interactions between the Regulatory CarS Protein and Light Response in Fusarium. BMC Genom. 2019, 20, 67.
  29. Mende, K.; Homann, V.; Tudzynski, B. The Geranylgeranyl Diphosphate Synthase Gene of Gibberella fujikuroi: Isolation and Expression. Mol. Genet. Genom. 1997, 255, 96–105.
  30. Díaz-Sánchez, V.; Estrada, A.F.; Trautmann, D.; Al-Babili, S.; Avaard, J. The Gene carD Encodes the Aldehyde Dehydrogenase Responsible for Neurosporaxanthin Biosynthesis in Fusarium fujikuroi. FEBS J. 2011, 278, 3164–3176.
  31. Wiemann, P.; Brown, D.W.; Kleigrewe, K.; Bok, J.W.; Keller, N.P.; Humpf, H.-U.; Tudzynski, B. FfVel1 and FfLae1, Components of a Velvet-like Complex in Fusarium fujikuroi, Affect Differentiation, Secondary Metabolism and Virulence. Mol. Microbiol. 2010, 77, 972–994.
  32. Bayram, O.; Krappmann, S.; Ni, M.; Bok, J.W.; Helmstaedt, K.; Valerius, O.; Braus-Stromeyer, S.; Kwon, N.-J.; Keller, N.P.; Yu, J.-H.; et al. VelB/VeA/LaeA Complex Coordinates Light Signal with Fungal Development and Secondary Metabolism. Science 2008, 320, 1504–1506.
  33. Niehaus, E.-M.; Rindermann, L.; Janevska, S.; Münsterkötter, M.; Güldener, U.; Tudzynski, B. Analysis of the Global Regulator Lae1 Uncovers a Connection between Lae1 and the Histone Acetyltransferase HAT1 in Fusarium fujikuroi. Appl. Microbiol. Biotechnol. 2018, 102, 279–295.
  34. Castrillo, M.; García-Martínez, J.; Avalos, J. Light-Dependent Functions of the Fusarium fujikuroi CryD DASH Cryptochrome in Development and Secondary Metabolism. Appl. Environ. Microbiol. 2013, 79, 2777–2788.
  35. Audhya, T.K.; Russell, D.W. Production of Enniatins by Fusarium sambucinum: Selection of High-Yield Conditions from Liquid Surface Cultures. J. Gen. Microbiol. 1974, 82, 181–190.
  36. Bayram, Ö.S.; Dettmann, A.; Karahoda, B.; Moloney, N.M.; Ormsby, T.; McGowan, J.; Cea-Sánchez, S.; Miralles-Durán, A.; Brancini, G.T.P.; Luque, E.M.; et al. Control of Development, Secondary Metabolism and Light-Dependent Carotenoid Biosynthesis by the Velvet Complex of Neurospora crassa. Genetics 2019, 212, 691–710.
  37. Bayram, O.; Braus, G.H.; Fischer, R.; Rodriguez-Romero, J. Spotlight on Aspergillus nidulans Photosensory Systems. Fungal Genet. Biol. 2010, 47, 900–908.
  38. Gil-Sánchez, M.D.M.; Cea-Sánchez, S.; Luque, E.M.; Cánovas, D.; Corrochano, L.M. Light Regulates the Degradation of the Regulatory Protein VE-1 in the Fungus Neurospora crassa. BMC Biol. 2022, 20, 149.
  39. Jiang, J.; Liu, X.; Yin, Y.; Ma, Z. Involvement of a Velvet Protein FgVeA in the Regulation of Asexual Development, Lipid and Secondary Metabolisms and Virulence in Fusarium graminearum. PLoS ONE 2011, 6, e28291.
  40. Merhej, J.; Urban, M.; Dufresne, M.; Hammond-Kosack, K.E.; Richard-Forget, F.; Barreau, C. The Velvet Gene, FgVe1, Affects Fungal Development and Positively Regulates Trichothecene Biosynthesis and Pathogenicity in Fusarium graminearum. Mol. Plant Pathol. 2012, 13, 363–374.
  41. López-Berges, M.S.; Hera, C.; Sulyok, M.; Schäfer, K.; Capilla, J.; Guarro, J.; Di Pietro, A. The Velvet Complex Governs Mycotoxin Production and Virulence of Fusarium oxysporum on Plant and Mammalian Hosts. Mol. Microbiol. 2013, 87, 49–65.
  42. Beattie, G.A.; Hatfield, B.M.; Dong, H.; McGrane, R.S. Seeing the Light: The Roles of Red- and Blue-Light Sensing in Plant Microbes. Annu. Rev. Phytopathol. 2018, 56, 41–66.
  43. Yu, Z.; Fischer, R. Light Sensing and Responses in Fungi. Nat. Rev. Microbiol. 2019, 17, 25–36.
  44. Purschwitz, J.; Müller, S.; Kastner, C.; Schöser, M.; Haas, H.; Espeso, E.A.; Atoui, A.; Calvo, A.M.; Fischer, R. Functional and Physical Interaction of Blue- and Red-Light Sensors in Aspergillus nidulans. Curr. Biol. 2008, 18, 255–259.
  45. Schumacher, J. How Light Affects the Life of Botrytis. Fungal Genet. Biol. 2017, 106, 26–41.
  46. Corrochano, L.M. Light in the Fungal World: From Photoreception to Gene Transcription and Beyond. Annu. Rev. Genet. 2019, 53, 149–170.
  47. Estrada, A.F.; Avalos, J. The White Collar Protein WcoA of Fusarium fujikuroi Is Not Essential for Photocarotenogenesis, but Is Involved in the Regulation of Secondary Metabolism and Conidiation. Fungal Genet. Biol. 2008, 45, 705–718.
  48. Kim, H.; Son, H.; Lee, Y.-W. Effects of Light on Secondary Metabolism and Fungal Development of Fusarium graminearum. J. Appl. Microbiol. 2014, 116, 380–389.
  49. Ruiz-Roldán, M.C.; Garre, V.; Guarro, J.; Mariné, M.; Roncero, M.I. Role of the White Collar 1 Photoreceptor in Carotenogenesis, UV Resistance, Hydrophobicity, and Virulence of Fusarium oxysporum. Eukaryot. Cell 2008, 7, 1227–1230.
  50. Tang, Y.; Zhu, P.; Lu, Z.; Qu, Y.; Huang, L.; Zheng, N.; Wang, Y.; Nie, H.; Jiang, Y.; Xu, L. The Photoreceptor Components FaWC1 and FaWC2 of Fusarium asiaticum Cooperatively Regulate Light Responses but Play Independent Roles in Virulence Expression. Microorganisms 2020, 8, 365.
  51. Castrillo, M.; Avalos, J. The Flavoproteins CryD and VvdA Cooperate with the White Collar Protein WcoA in the Control of Photocarotenogenesis in Fusarium fujikuroi. PLoS ONE 2015, 10, e0119785.
  52. Castrillo, M.; Avalos, J. Light-Mediated Participation of the VIVID-like Protein of Fusarium fujikuroi VvdA in Pigmentation and Development. Fungal Genet. Biol. 2014, 71, 9–20.
  53. Castrillo, M.; Bernhardt, A.; Avalos, J.; Batschauer, A.; Pokorny, R. Biochemical Characterization of the DASH-Type Cryptochrome CryD from Fusarium fujikuroi. Photochem. Photobiol. 2015, 91, 1356–1367.
  54. Alejandre-Durán, E.; Roldán-Arjona, T.; Ariza, R.R.; Ruiz-Rubio, M. The Photolyase Gene from the Plant Pathogen Fusarium oxysporum f. Sp. lycopersici Is Induced by Visible Light and Alpha-Tomatine from Tomato Plant. Fungal Genet. Biol. 2003, 40, 159–165.
  55. Adam, A.; Deimel, S.; Pardo-Medina, J.; García-Martínez, J.; Konte, T.; Limón, M.C.; Avalos, J.; Terpitz, U. Protein Activity of the Fusarium fujikuroi Rhodopsins CarO and OpsA and Their Relation to Fungus-Plant Interaction. Int. J. Mol. Sci. 2018, 19, 215.
  56. Prado, M.M.; Prado-Cabrero, A.; Fernández-Martín, R.; Avalos, J. A Gene of the Opsin Family in the Carotenoid Gene Cluster of Fusarium fujikuroi. Curr. Genet. 2004, 46, 47–58.
  57. Estrada, A.F.; Avalos, J. Regulation and Targeted Mutation of opsA, Coding for the NOP-1 Opsin Orthologue in Fusarium fujikuroi. J. Mol. Biol. 2009, 387, 59–73.
More
ScholarVision Creations