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Cα traces of the NaCl/Tris form (blue) and the 1qnj structure (orange). The catalytic triad, Ser195, His57 and Asp102, is shown in a ball-and-stick representation. A chloride ion (green ball) binds near the catalytic triad and Tris (displayed in stick representation) binds to the S4 and S5 subsites.
