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Definition of Citrulline
1. Noun. An amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine. 
Definition of Citrulline
1. [n -S]
Medical Definition of Citrulline
1. 
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1. Noun. An amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine. 
1. [n -S]
1.