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Treatment of cultures of the ciliate Tetrahymena with fetal bovine serum (FBS) enhanced the rate of cell proliferation. The growth promoting activity was partially purified from FBS as a high Mr complex including four components with apparent Mr values of 180 kDa, 68 kDa, 60 kDa and 30 kDa by a 4-step procedure. The 180 kDa component was identified by amino acid sequencing as α2-macroglobulin. The addition of purified α2-macroglobulin from bovine plasma to cultures of Tetrahymena was also found to enhance the rate of cell proliferation. This report is the first dealing with the direct identification of a mammalian factor which promotes the growth of free-living protozoa.
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