Any of many glycoproteins that have heteropolysaccharide side chains(noun)
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Use "proteoglycan" in a sentence
"Should the GA wish to ensure such adherence, I would recommend proteoglycan therapy for the participants."
"During labour the uterus can be divided into two regions, the upper, muscular region and the lower region which generally acts to provide a passive fibromuscular birth canal. cervix consists largely of fibrous collagen in a proteoglycan matrix."
"The GPC5 gene encodes glypican 5, one of the six members of the heparan sulfate proteoglycan (HSPG) family."