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Asp49-Arg0-Ser(-2) reaction triad. Pair fitting of the proposed pro-hG1B triad with the trypsin catalytic triad is shown. Asp49, Ser-2, and Arg0 of pro-hG1B are colored in orange. Asp102, His57, and Ser95 of trypsin (PDB code: 1K1I) are colored in cyan.
