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Crystal structure of a cyclic AMP-independent mutant of catabolite gene activator protein in which Ala144 is replaced by threonine was determined at 2. Nine of these amino acids (histidine, lysine, tryptophan, phenylalanine, methionine, valine, isoleucine, threonine, and leucine) are termed "essential" because we must obtain them from food. For example, GCC spells alanine in the cell's language, while ACC spells threonine. |
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