Timeline of hematopoietic stem cell (HSC) and blood marrow transplant (BMT) discoveries. (HSCT) Hematopoietic stem cell transplant, (SCID) severe combined immunodeficiency, (ST-HSC) short-term HSC, (LT-HSC) long-term HSC, (iPS) induced pluripotent stem cells, (HLA) human leukocyte antigen, (CAR) chimeric antigen receptor.