Colony forming units (CFU) in bone marrow associated with heterotopic bone formation by epithelial cells grafted in mice.

The presence of bone marrow accompanying heterotopic bone induction in mice did not increase the number of endogenous spleen colonies. However, such bone marrow, as judged by the ability to form exogenous spleen colonies, contains colony-forming cells (CFC). No significant difference was found between the concentration of CFC in the induced and in the femoral bone marrow. This indicates a qualitative similarity between these two types of bone marrow inasfar as hemopoietic activity is concerned.