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Complementation studies by reactivation of inactive mutant enzymes. The following mutant enzymes were mixed: T140A + K268Q (open circles); S306A + K268Q (closed upright triangles); T140A + H68Q (open squares); S306A + H141Q (upside-down open triangles); T140A + H141Q (closed circles); and S306A + H68Q (closed squares).
