Assertion: hemoglobin's oxygen | /r/CapableOf | bind to heme
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Source sentences:
text: As discussed in Schechter (2013), among the most highly conserved amino acids within hemoglobin subunits are two histidines, one at helix position F8, which binds to the heme iron and one at E7 in the pocket where oxygen and other ligands bind to heme.