When haptoglobin capacity to buffer hemoglobin is overwhelmed, hemoglobin undergoes a rapid conversion to methemoglobin. Ferriheme is transferred directly from methemoglobin to hemopexin (Miller et al. 1996, Mauk and Mauk 2010).
Smith, A, Morgan, WT, Shaklai, N, Miller, YI
Mauk, AG, Mauk, MR
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