
Citrullination or deimination is the conversion of the amino acid arginine in a protein into the amino acid citrulline. Enzymes called peptidylarginine deiminases (PADs) replace the primary ketimine group (=NH) by a ketone group (=O). Citrullination controls the expression of genes, particularly in the developing embryo. The immune system often at...
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http://en.wikipedia.org/wiki/Citrullination

The enzymatic conversion, by peptidyl arginine deiminase, of an arginine in a protein to a citrulline.
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http://www.roitt.com/glossary.asp
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