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Possible interactions at the subunit interfaces. A–D, the possible interactions at the subunit interfaces around Gly-122 (A), Asp-36/Tyr-130 (B), Ser-111/Ala-137 (C), and Met-225 (D) are shown. Molecule A, molecule B, and molecule D in the quaternary structure are colored in green, blue, and yellow, respectively. Possible hydrogen bonds and contacts between two atoms are indicated as dotted lines with the distances listed in angstroms.
