. "Catalysis of the reaction: N-acetyl-alpha-D-glucosaminyl-(1,4)-beta-D-glucuronosyl-proteoglycan + UDP-alpha-D-glucuronate = beta-D-glucuronosyl-(1,4)-N-acetyl-alpha-D-glucosaminyl-(1,4)-beta-D-glucuronosyl-proteoglycan + UDP." . . "N-acetylglucosaminyl-proteoglycan 4-beta-glucuronosyltransferase activity" . "heparan glucuronyltransferase II activity" . "N-acetylglucosaminyl-proteoglycan 4-b-glucuronosyltransferase activity" . "N-acetylglucosaminylproteoglycan beta-1,4-glucuronyltransferase activity" . "UDP-alpha-D-glucuronate:N-acetyl-alpha-D-glucosaminyl-(1->4)-beta-D-glucuronosyl-proteoglycan 4-beta-glucuronosyltransferase activity" . . .