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 …
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,…