methionine
Methionine - definition from Biology-Online.org
[(Science: biochemistry) Contains the SCH3 group that can act as a methyl donor (see s adenosyl methionine). Common in proteins but at low frequency. The met x linkage is subject to specific cleavage by cyanogen bromide. See: formyl peptides. A crystalline amino acid containing sulfur; found in most proteins and essential for nutrition.One of 20 [[amino acids commonly found in [[ proteins.
MediLexicon methionine - Medical Dictionary Definition for Term 'methionine'
[1. The l-isomer is a nutritionally essential amino acid and the most important natural source of “active methyl” groups in the body, hence usually involved in methylations in vivo; the dl-form is used as an adjunct in the treatment of liver diseases.
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