Assertion: catalytic histidine | /r/AtLocation | helix α1 fig. 1
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Source sentences:
text: The histidine triad (H126 and the HUH motifs H133 and H135) that coordinates the manganese ion required by the protein (7) is located on strands β4 and β5, whereas the catalytic histidine (H22; see below) is located at helix α1 (Fig. 1).