Dictionary![]() ![]() pro•linePronunciation: (prō'lēn, -lin), [key] —n. Biochem. an alcohol-soluble amino acid, C4H9NHCOOH, occurring in high concentration in collagen. Abbr.: Pro; Symbol: P Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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