Effect of synthetic analogues of atrial natriuretic factor (ANF) on proliferative response and natural cytotoxic lymphocytes of human subjects was investigated in vitro. ANF-III and ANF-IV increased blast transformation lymphocytes induced by a Con-A suboptimal dose. The increase of cells activity was comparable with the effect of interleukin-2, added at a dose of 50-100 unit/ml.

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