[proh-leen, -lin]
noun Biochemistry.
an alcohol-soluble amino acid, C 4 H 9 NHCOOH, occurring in high concentration in collagen. Abbreviation: Pro; Symbol: P

1900–05; alteration of pyrrolidine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proline (ˈprəʊliːn, -lɪn)
a nonessential amino acid that occurs in protein
[C20: from pyrrolidine]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

proline pro·line (prō'lēn')
Abbr. Pro
An amino acid that is found in most proteins and is a major constituent of collagen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
proline   (prō'lēn')  Pronunciation Key 
A nonessential amino acid. Chemical formula: C5H9NO2. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for proline
Casein consists of a fairly high number of proline peptides, which do not interact.
Hydroxylation of lysine and proline amino acids occurs inside the lumen.
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