Assertion: cytochrome's heme | /r/HasProperty | b 3 cmd methyl groups
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text: Heme b exhibits a nearly flat macrocyclic ring structure, as in other HCOs, but is turned toward heme b 3 , thereby creating van der Waals contacts between the heme b CMA and the heme b 3 CMD methyl groups, as well as between the two propionate ligands of the Ca2+ complex (Fig. 2B).