单词	methionine
释义	methionine /mɪˈθʌɪəniːn / noun [mass noun] Biochemistry A sulphur-containing amino acid which is a constituent of most proteins and is essential to the diet of vertebrates. Chemical formula: CH3S(CH2)2CH(NH2)COOH. They fix nitrogen and so contain high quality protein, including the essential amino acids methionine and cystine.... The oxidation sites of alpha-crystallin are considered to be methionine, cysteine and tryptophan amino acid residues. For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine. Origin 1920s: from methyl + Greek theion 'sulphur'.
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