A Convenient Source of Cfu-S Inhibitors: the Fetal Calf Liver

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Abstract
The presence of a bone-marrow stem-cell inhibitor able to prevent CFU-s [colony forming cell] entry into DNA synthesis after cytosine arabinoside (Ara-C) treatment was detected in 7-mo.-old fetal calf liver. The inhibitory fraction was obtained through ultrafiltration of a delipidated tissue extract powder and purified by BioGel-P-2 chromatography. The elution pattern on Sephadex G10 is similar to that of the bone-marrow inhibitory extract previously obtained from fetal calf bone marrow. It corresponds to a low MW molecule (MW < 2000), devoid of species specificity and having no inhibitory effect on GM -CFC proliferation.