take their place. when cancer develops, however, this orderly process breaks down. as cells become more and more abnormal, old or damaged cells survive when they should die, and new cells form when they are not needed. these extra cells can divide without stopping and may form growths called tumors....
al., ; kaufmann et al., ). because hofbauer cells are the only immune cells in the placenta and appear in the villous core from around day postcoitum, before there is any vascular connection to the embryo itself, they are likely to be generated from haemangioblastic cells in extra-embryonic tissue (...
ips cells were established by introducing a small number of genes into ordinary human somatic (differentiated) cells. these pluripotent cells can differentiate into any type of cell in the body and proliferate indefinitely in culture....