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Mutants of phenylalanine dehydrogenase (PheDH) from Bacillus sphaericus with improved activity and specificity towards an unsaturated non-natural amino acid of commercial interest, propargylglycine, have been obtained by directed evolution after screening 10,000 colonies. An effective high-throughput screening assay for the detection of amino acid dehydrogenase activity using spectrophotometric measurement...
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