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The effects of extracts from intact and regenerating planarians on cell behaviour in culture were studied. The extracts were added to the culture of Chinese hamster fibroblasts and to the primary culture of human lymphocytes. Some extracts contained active agents which influenced the proliferation of fibroblasts increasing or decreasing the mitotic index. The extracts exerted no effect on the mitotic index of lymphocytes. When the extracts were added to the lymphocyte culture together with phytohemagglutinin, which induces the proliferation, the mitotic index somewhat increased. The extracts of regenerating planarians contain factors which activate and inhibit cell proliferation in culture. The active factors stimulated, rather than induced proliferation.
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I M Sheĭman, and
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I M Sheĭman, and
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I M Sheĭman, and
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