INDEPENDENCE DAY. On July 4, 1776, the thirteen colonies claimed their independence from England, an event which eventually led to the formation of the United States.
Polycythemia vera is a rare, chronic disorder involving the overproduction of blood cells in the bone marrow (myeloproliferation). The overproduction of red blood cells is most dramatic, but the production of white blood cells and platelets are also elevated in most cases.
Polycythemia vera is a condition of unknown cause in which there is a. long-term increase in red blood cells and other types of cells. Another such condition is myelofibrosis, in. which the normal bone marrow is replaced by fibrous tissue (the connective tissue of the body).