MethoCult™ M3231 is an incomplete medium formulation that contains methylcellulose in Iscove's MDM. MethoCult™ M3231 is suitable for the growth and enumeration of hematopoietic progenitor cells in colony-forming unit (CFU) assays of mouse bone marrow, spleen, peripheral blood, and fetal liver, when the appropriate growth factors and supplements are added. This formulation does not contain erythropoietin or other cytokines.