Ainda não temos significados para "free carboxyl".
1Amino acids terminating in free carboxyl or carboxylic acid ester groups were mostly inactive.
2The length of the carbon chain, degree of unsaturation, and availability of a free carboxyl group were important determinants of fatty acid activity.
3Tests with other substrate analogs indicated that a free carboxyl group was required for enzyme activity, and that a free amino group was not.
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