Assertion: alternative mechanism | /r/HasProperty | proposed for certain mb mutants
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text: An alternative mechanism in which two hydrogen atoms of Hare directly transferred to the oxoferryl group (Figure 1 b), was proposed for certain Mb mutants lacking a distal residue that could act as acid−base catalyst (H64X; X being Ala, Ser and Asp, and L29H/H64L).