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What is the key role of Chondroitin sulfate proteoglycans?

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What is the key role of Chondroitin sulfate proteoglycans?

(a) Extracellular matrix interaction

(b) Protection to cell

(c) Production of proteins

(d) Digesting the toxins

The question was posed to me in an online interview.

My query is from Interaction of Cells with Extracellular Matrix topic in portion Extracellular Matrix and Cell Interactions of Cell Biology

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The correct choice is (a) Extracellular matrix interaction

To explain I would say: Proteoglycans are protein substances present in the extracellular matrix of the cell. Chondroitin sulfate proteoglycans abbreviated as CSPG is well known for its function of extracellular matrix interaction.

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