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Mass spectrum of a tryptic fragment of TYW1. TYW1 incubated with (A) 1,2,3-13C3 pyruvate in the presence of NaCNBH3, (B) 1,2,3-13C3 pyruvate in the presence of NaCNB2H3, (C) no pyruvate in the presence of NaCNBH3, and (D) no pyruvate in the presence of NaCNB2H3.
