CD48 was the first B-cell-specific cellular differentiation antigen identified in transformed B lymphoblasts. In differentiating haematological disorders it will stain myeloblasts but not lymphoblasts. Others can involve the formation of tumors from lymphoblasts from within the lymphoid tissue. Commonly, when speaking about leukemia, "blast" is used as an abbreviation for lymphoblasts. Sporozoites enter lymphoblasts to form a schizont. Lymphoblasts, even with the mutation present, may continue to express some functional IKAP protein. Normal lymphoblasts develop into mature, infection-fighting B-cells or T-cells, also called lymphocytes. Both McCrae and Auer mistakenly thought that the cells containing the rods were lymphoblasts. Lymphoblasts can also refer to immature cells which typically differentiate to form mature lymphocytes.