Erythrocytosis, Familial, 6, also known as familial erythrocytosis 6, is related to sickle cell disease and related diseases and hemoglobin e-beta-thalassemia syndrome. An important gene associated with Erythrocytosis, Familial, 6 is HBB (Hemoglobin Subunit Beta), and among its related pathways/superpathways are Transport of inorganic cations/anions and amino acids/oligopeptides and Oxidation by cytochrome P450. Affiliated tissues include lung, and related phenotypes are polycythemia and increased hematocrit