bone marrow <span>contains hematopoietic stem cells, which give rise to the three classes of blood cells that are found in the circulation: white blood cells (leukocytes), red blood cells (erythrocytes), and platelets (thrombocytes)</span>
not only do i know this is true from personal experince but other sources can back me up on this....its almost like they want someone to know just how truly bad they are/were
