Many of the sugars attached to the protein backbone of a proteoglycan molecule are fibronectin.

Name: Many of the sugars attached to the protein backbone of a proteoglycan molecule are fibronectin.
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Fibronectin is a separate protein from proteoglycans and does not attach to the protein backbone of proteoglycans. Proteoglycans have various types of sugars attached to their protein backbone, such as chondroitin sulfate and keratin sulfate.

Many of the Sugars Attached to the Protein Backbone of a Proteoglycan