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Medium conditioned by human lung tissue was found to contain colony stimulating activity (CSA). This material was tested against mouse and human bone marrow as target system. Colony forming units (CFUc) from both species responded and gave rise to clonal growth in agar cultures. This colony formation was dose dependent and the relationship was a sigmoid one. Experiments to determine the molecular weight of human lung derived colony stimulating Factors brought evidence for four active molecular weight fractions with approximately 79000, 40000, 23000 and 2000 daltons. The 23000 dalton fraction activated human cells only, whereas the other fractions were active on both human and mouse bone marrow cells.
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