1RD6:
reference: Mutation of a conserved tryptophan in the chitin-binding cleft of Serratia marcescens chitinase A enhances transglycosylation., Aronson NN Jr, Halloran BA, Alexeyev MF, Zhou XE, Wang Y, Meehan EJ, Chen L, Biosci Biotechnol Biochem. 2006 Jan;70(1):243-51. PMID: 16428843

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