Abstract
Colony promoting activity (CPA) was detected in the supernatants of the bone marrow cell cultures. CPA itself had no granulocyte-macrophage colony stimulating activity (CSF); but did increase the number and the size of colonies induced by the optimal dose of CSF. This activity was dose dependent and not specific to CSF sources. CPA-responsive cells (target cells) were found in the bone marrow cell cultures as well as in the freshly isolated bone marrow.
Published Version
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