label: protein-heparan sulfate linkage via heparan sulfate D-glucuronyl-D-galactosyl-D-galactosyl-D-xylosyl-L-serine
label_lc: protein-heparan sulfate linkage via heparan sulfate d-glucuronyl-d-galactosyl-d-galactosyl-d-xylosyl-l-serine