urinary excretion of glycosaminoglycans ( gags ) and sialic acid ( sa ) , as well as the activity of two renal enzymes related to glycoprotein metabolism , n-acetyl-beta-d-glucosaminidase ( nag ) and beta-galactosidase ( gal ) , and two others unrelated to glycosaminoglycans and glycoprotein metabolism , gamma-glutamyltranspeptidase ( gamma-gt ) and angiotensin-i-converting enzyme ( ace ) , were evaluated in 40 insulin-dependent diabetic patients with normal range albuminuria , 21 patients with mesangial glomerulonephritis , and 30 control subjects .
C0022646
renal
C0017655
mesangial