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Proteoglycans are proteins that vary in size, localization, and degree of post-translational modifications.
There are many different proteoglycans that vary in size and degree of glycosylation. In addition, the localization of these molecules varies depend-ing on the type and tissue, as some are bound to the extracellular matrix through hyaluronan or collagen (top panel) or found in the membrane or excreted into the extracellular space (bottom panel).
