Hemopoietic stem cells are fixed within bone marrow, but as soon as they start to come into a progeninose cell and then become more like their functional outcome, then they move into the blood. The ones that will make the connective tissues from all the blood driven products come from that one population of cells. But interestingly, if you took up... No, no, it would be good to hear something interesting. You know when you did the pile of cells for me? Yes. About 40% of those cells, somewhere between 40 to 60%, is only one cell type: red blood cells.