Distribution of the different types of colonies in methylcellulose cultures of bone marrow cells from compound RARα1^−/−γ^−/− null mice and littermate or wild-type controls. Colonies were scored on day 7 and the results expressed as percent total colony count (left panel). Total number of nucleated bone marrow cells recovered from the long bones of RARα1^−/−γ^−/− mice and wild-type controls or heterozygous littermates. There was no significant difference among the four groups (right panel).