Colony-Forming Units AssayHematopoietic Stem CellsClone CellsCells, CulturedCell DivisionStem CellsBone Marrow CellsCulture MediaInterleukin-3Cell DifferentiationIntensive Care UnitsEmbryonic Stem CellsHematopoiesisColony-Stimulating FactorsTumor Stem Cell AssayBone MarrowCell Culture TechniquesSpermatogoniaCell CountPhytohemagglutininsStem Cell FactorHematopoietic Cell Growth FactorsCell LineCell SeparationOctamer Transcription Factor-3MegakaryocytesCell ProliferationCell SurvivalGrowth Substances