The regulation of numbers of primitive hemopoietic cells.
D000818:Animals; D001769:Blood / Q000528:radiation effects*; D002999:Clone Cells; D004921:Erythropoietin / Q000096:biosynthesis*; D066298:In Vitro Techniques; D007503:Iron Isotopes; D051379:Mice; D011830:Radiation Effects; D013154:Spleen / Q000528:radiation effects*
D007503:Iron Isotopes; D004921:Erythropoietin