in order to assess initial tubular involvement , the activities of some urinary enzymes were measured : n-acetylglucosaminidase ( nag , ec 3.2.1.30 ) , microsomal amino-peptidase ( map , ec 3.4.11.2 ) and gamma-glutamyltransferase ( ggt ; ec 2.3.2.2 ) .
C0030940
peptidase
C0020289
ec