A 44 y/o woman with PNH and aplastic anemia presented with 5 months of progressive painful purpuric nodules. Examination revealed firm, pink to purple, tender nodules in her lower and upper extremities and trunk. Biopsy revealed an edematous dermis,…
Hemoglobin is an oxygen-binding protein found in erythrocytes that transports oxygen from the lungs to tissues. Each hemoglobin molecule is a tetramer made of four polypeptide globin chains. Each globin subunit contains a heme moiety formed of an …
