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However, the S version is an acetylated form of the L variant

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coli GGT has been reported to exhibit poor specificity toward D-amino acids as -glutamyl acceptors ( Allied Applications of Microbial GGTs In addition to transpeptidase and hydrolytic activities, a few microbial GGTs have also been reported to exhibit some unique activities like cephalosporin acylase (CA) and -aspartyl transferase (BAT), as they can act on substrates like glutaryl-7-aminocephalosporanic acid and asparagine, respectively

Use a new vial and track your process more carefully next time