Phylogenetic tree of ARII and related proteins. The tree was constructed by using the CLUSTAL V program (6). Abbreviations: HSADR, human aldose reductase (4); HSALR, human aldehyde reductase (4); ARI, S. salmonicolor ARI (13); HSCRE, human carbonyl reductase (32); ZMDFR, Z. mays dihydroflavonol 4-reductase (25); EGCCR, E. gunnii cinnamoyl-CoA reductase (15); ARII, S. salmonicolor ARII (this study); HS3BHSDH, human 3β-hydroxysteroid dehydrogenase (19); NSCDH, Nocardia sp. cholesterol dehydrogenase (7); ECGALE, E. coli UDP-galactose 4-epimerase (17).