Collagen is a protein that helps keep skin, bones and tendons strong and healthy. It is important for blood vessel health and prevents atherosclerosis. Meat and fish that contain connective tissues, gelatin, and broth made by boiling bones and meat over several hours are all rich in collagen. The presence of glycine in every third position and high concentrations of proline, hydroxyproline and interchain hydrogen bonding stabilize the three left-handed polyproline ...
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