Phylogenetic tree of FSA and its closest relatives. FSA, Flavobacteriaceae Sinomicrobium α-amylase, present study; LEEBL, Leeuwenhoekiella blandensis; ZOBGA, Zobellia galactanivorans; FLAJO, Flavobacterium johnsoniae; AQUAG, Aquimarina agarilytica; PYRFU, Pyrococcus furiosus; PYRWO, P. woesei; THEHY, Thermococcus hydrothermalis; THEON, T. onnurineus; THETH, T. thioreducens; ARATH, Arabidopsis thaliana; VIGMU, Vigna mungo seed; ORYOR, Oryzeae Oryza; TRIAE, Triticum aestivum; HORVU1, Hordeum vulgare; HORVU2, H. vulgare; ASPOR, Aspergillus oryzae; ASPNI, A. niger; THENA, Thermotoga naphthophila; ESCOO, Escherichia coli; GEOST, Geobacillus stearothermophilus; BACLI, Bacillus licheniformis; BACSU, B. subtilis; BACAC, B. acidicola; BACHA, B. halmapalus; BACAM, B. amyloliquefaciens; XANCA, Xanthomonas campestris. Bootstrap percentages >50% (based on 1,000 replications) are shown at branch points.