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“Glycine, lysine, arginine, valine, isoleucine , and tryptophan in the second position are (with N-terminal serine) strongly inhibitory, and proline completely blocks modification.”
“Phenylalanine and tyrosine inhibit one site; proline and the straight-chain amino acids, alanine, methionine and cysteine inhibit another; and glycine and the branched-chain valine, leucine, and isoleucine inhibit a 3rd.”