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  Theβ-N-Acetyl-D-glucosaminidase(NAGase,EC3.2.1.52) is one of the chitinases and cooperates with chitinases to catalyze the cleavage of N-acetylglucosamine(NAG) polymers into NAG.It is widely distributed in animal tissues,in plants,and in microorganism.NAGase in the crustaceans play important roles in molting and digestion of chitinous foods[1,2].Betaine(Glycine betaine,……