Dulbecco's Modified Eagle Medium: Nutrient Mixture F12 (DMEM F12) is a widely used basal medium for supporting the growth of many different mammalian cells including MDCK, glial cells, fibroblasts, human endothelial cells, and rat fibroblasts. DMEM F12 is a 1:1 mixture of DMEM and Ham's F12 media. This formulation combines DMEM's high concentrations of glucose, amino acids, and vitamins with the wide variety of components found in Ham's F12 media.