Most papers I read use NSG mice to test the quality of human HSC or progenitor cells derived from other cells (hESCS or fibroblast). Those mice have immune deficiency which confirm the survival of human cells. I have a question here, does this affect the homing of HSC to the BM? Do they secrete sufficient cytokines for the HSC develop(I think HSC derived from other tissue cells have more aspirations for the Environment than HSC collected from BM, )