<prompt> Serum gamma-glutamyl transpeptidase increase in GGTmuscle injuryAlcoholismMuscular dystrophyMycardial infarction  <response>: GGT have 11 isoenzymesIt is seen in liver pancreas intestinal cells and prostate glandsNormal level is 10-30 ULGGT is clinically impoant because of its sensitivity to detect alcohol abuseModerately increase in infective hepatitis and prostate cancerRef: DM Vasudevan - Textbook of Biochemistry, 8th edition, page no: 82 