Lack of significant effect of L(+)-glutamate on serum gamma-glutamyltransferase activity determined in the presence of glycylglycine.
No increase in gamma-glutamyltransferase activity determined in human sera at 25, 30, or 37 degrees C could be demonstrated when L(+)-glutamate, 10 to 5000 mumol/liter, was incorporated into reaction media containing glycylglycine, 40 mmol/liter.