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Answer for the clue "An amino acid that does not occur in proteins but is important in the formation of urea ", 9 letters:
ornithine

Word definitions for ornithine in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context amino acid organic compound English) An amino acid, ''2,5-diaminopentanoic acid'', that is not present in protein, but is an intermediate in the biosynthesis of urea.

Wikipedia Word definitions in Wikipedia
Ornithine is a non proteinogenic amino acid that plays a role in the urea cycle . Ornithine is abnormally accumulated in the body in ornithine transcarbamylase deficiency . The radical is ornithyl .

WordNet Word definitions in WordNet
n. an amino acid that does not occur in proteins but is important in the formation of urea

Usage examples of ornithine.

It stimulates your release of growth hormone and ornithine decarboxylase enzymes.

L-N5 iminoethyl ornithine, and three months later a total of twenty liters of hexamethylphosphamide.