primary cultures of endothelial cells , fetal fibroblasts , adult fibroblasts , amnion epithelial cells , renal parenchymal cells , and ovarian carcinoma cells inhibited nk activity when peripheral blood lymphocytes were preincubated on target cell monolayers for 18 h before testing the cytotoxicity against k-562 .
C0016030
fibroblasts
C0007634
cells