Assertion: vanillin's group | /r/CapableOf | achieve higher turnover of precursors
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text: By these efforts, the group managed to construct mutant versions of the human COMT carrying either an L198Y or an E199A mutation, which made the mutated enzyme almost entirely specific for methylation at the meta position, thus avoiding undesired isovanillin production as well as achieving a higher turnover of precursors ().