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The enzyme gamma - glutamyltransferase ( GGT ) catalyzes the hydrolysis of the gamma - glutamyl isopeptide bond of glutathione conjugates ( donor substrates ) , releasing glutamic acid , or the transfer of the donor ' s gamma - glutamyl group to an acceptor substrate , such as a dipeptide .
 Chemical: gamma - glutamyl; Chemical: glutathione; Chemical: glutamic acid; Chemical: gamma - glutamyl; Chemical: dipeptide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: gamma - glutamyl; Chemical: glutathione; Chemical: glutamic acid; Chemical: gamma - glutamyl; Chemical: dipeptide