AbstractSingle cells from developing two day granulocytic bone marrow colonies were transfered in agar cultures. After three to five days, 48 of 239 transfered single cells had transformed to single macrophages or proliferated to form aggregates of pure macrophages or mixed macrophage‐granulocyte aggregates. Some granulocytes in colonies developingin vitrofrom bone marrow cells appear to have the capacity to transform to macrophage
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