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countable and uncountable, plural methionines
(biochemistry, organic chemistry) A lipotropic, sulphur-containing essential amino acid, C5H11NO2S, found in most protein. quotations examples
The purpose was to make soya beans more healthy for those for whom they are a staple food by correcting soya beans' natural deficiency in a chemical called methionine.
1999, Matt Ridley, Genome, Harper Perennial, published 2004, page 253