Fig. 7. Endothelial and hematopoietic cells sorted from embryonic and fetal hematopoietic tissues yield identical blood cell progenies on MS-5 stroma. 26-day-old yolk sac CD34⁺ CD45⁺ and CD34⁺ CD45^– cells and 28-day AGM or 16-week fetal bone marrow CD34⁺ CD45^– cells were grown on MS-5 stromal cells. After 21 days, the whole content of co-cultures was harvested and double-stained with FITC-anti-CD34 and PE-anti-CD45 antibodies or simple-stained with PE-anti-CD33, FITC-anti-CD15, PE-anti-CD19 and PE-anti-CD56 antibodies. Immunostaining was analysed by flow cytometry. Hematopoietic cells were gated on forward and side scatter. YS, yolk sac; BM, bone marrow.