CSF3 and severe combined immunodeficiency: 2) In the hu-SRC model, the cells transplanted are human severe combined immunodeficiency (SCID) repopulating cells (SRC), that is to say: CD34+ hematopoietic stem cells (HSCs) from umbilical cord blood (UCB), fetal liver, bone marrow (BM) or granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood.