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Fluid-mosaic model. 1  Plasma membrane consists of a phospholipid bilayer studded with proteins, polysaccharides, lipids. 2  The lipid bilayer is semipermeable Regulates passage of substances into and out of the cell. H2O and some small, uncharged, molecules (O2, CO2) can pass through.
gamma-glutamyl transpeptidase (GGT), an enzyme that appears in the serum of patients with several types of liver or gallbladder disorders, including drug hepatotoxicity, biliary tract obstruction, alcohol-induced liver disease, and liver carcinoma. Normal adult (after 45 years of age) GGT blood levels are 8 to 38 U/L.