![]() These are formed in the myeloid part of the tree. Platelets are made from very large bone marrow cells called megakaryocytes. Immature lymphoid stem cells are called lymphoblasts (or just blast cells). Lymphoid stem cells develop into T-cells and B-cells. Immature myeloid stem cells are called myeloblasts (or just blast cells). ![]() Myeloid stem cells develop into red cells and some white cells ( neutrophils, eosinophils, basophils and monocytes) and platelets. These cells then develop into various types of blood cells: There are two types of progenitor cells that split the family tree: lymphoid cells and myeloid cells. They also make new cells that are closer to being blood cells, called progenitor cells. At the top of the tree are the blood stem cells (or hematopoietic stem cells), which are the youngest (most immature) blood-forming cells. Think of blood production like a family tree. You may have a bone marrow biopsy taken at the back of your hip (the iliac crest). In adults, it’s mostly in the spine (vertebrae) and hips, ribs, skull and breastbone (sternum). In children, haemopoiesis takes place in the long bones, like the thighbone (femur). Most blood cells are made in your bone marrow. Bone marrow is spongy tissue in the middle of certain bones. ![]()
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