HomeIs it possible to refreeze the hCD34 progenitor cells after having amplifed them in PromoCell Hemaotopoietic Progenitor Cell Expansion Medium XF? January 17, 2020 print this article Is it possible to refreeze the hCD34 progenitor cells after having amplifed them in PromoCell Hemaotopoietic Progenitor Cell Expansion Medium XF? Yes, it is possible to refreeze them.