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Abstract
Abstract By further study, a previously described inhibitor of lymphocyte proliferation and immunoglobulin synthesis, soluble inhibitory factor (SIF), has been shown to comprise two moieties; a nondialyzable protein, apparently inert with regard to inhibition of proliferation, and a polar lipid bound to the protein fraction, presumably by hydrophobic interaction. The lipid contained the activity responsible for inhibition of PHA-induced DNA synthesis. It was tentatively identified as a lipid with an as yet unidentified polar group, on the basis of mobility on thin layer chromatographic plates and behavior on silicic acid.
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