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|Section2= |Section5= |Section6= |Section7= |Section8= }} Arginine (, abbreviated as Arg or R) is an α-amino acid. It was first isolated in 1886.〔 The L-form is one of the 20 most common natural amino acids. At the level of molecular genetics, in the structure of the messenger ribonucleic acid mRNA, CGU, CGC, CGA, CGG, AGA, and AGG, are the triplets of nucleotide bases or codons that code for arginine during protein synthesis. Arginine was first isolated from a lupin seedling extract in 1886 by the Swiss chemist Ernst Schultze. In mammals, arginine is classified as a semiessential or conditionally essential amino acid, depending on the developmental stage and health status of the individual. Preterm infants are unable to synthesize or create arginine internally, making the amino acid nutritionally essential for them. Most healthy people do not need to supplement with arginine because their body produces sufficient amounts.〔(【引用サイトリンク】url=http://www.mayoclinic.org/drugs-supplements/arginine/background/hrb-20058733 )〕 ==Sources== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arginine」の詳細全文を読む スポンサード リンク
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