we measured the effect of lactoferrin ( a putative feedback regulator of csa production ) on csa provision in three separate assay systems wherein granulocyte colony growth of marrow cells from 22 normal volunteers was stimulated by ( a ) endogenous csa-producing cells in the marrow cells suspension , ( b ) autologous peripheral blood leukocytes in feeder layers , and ( c ) medium conditioned by peripheral blood leukocytes .
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growth of
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cells