heparosan-N-sulfate-glucuronate 5-epimerase; heparosan epimerase; heparosan-N-sulfate-D-glucuronosyl 5-epimerase; C-5 uronosyl epimerase; polyglucuronate epimerase; D-glucuronyl C-5 epimerase; poly[(1,4)-beta-D-glucuronosyl-(1,4)-N-sulfo-alpha-D-glu • • •