In this tissue, defects in thio·purine methyl·transferase cause enhanced toxicity of drugs such as azathioprine. Primary poly·cyt·haemia occurs when this tissue produces too much of certain cell types. ​​Dacrocytes are associated with fibrosis or malignant infiltrative disorders of this tissue. One cell type in this tissue expresses class VI beta-tubulin and can be up to 64-ploid. G.C.S.F is used to treat chemotherapy-induced suppression of this (-5[1])tissue. This tissue is the main source of mesenchymal stem cells. The first person cured of (*) HIV/AIDS received a transplant (10[1])of this tissue. Increased adiposity within this tissue may occur in osteoporosis. (10[1])This tissue is the primary site of haemato·poiesis and the site of platelet production and (10[1])B lymphocyte maturation. For 10 points, name this semi-solid tissue within the spongy portions of bones. ■END■