passages.id: split_8_test_1219_passage
passages.type: progene_text
passages.text: NK cells and some T cells express members of a multigenic family of killer cell inhibitory receptors ( KIRs ) including p70 KIR ( KIR3DL ) and p58 KIR ( KIR2DL ) family that recognize polymorphic class I MHC molecules on target cells and transmit an inhibitory signal to prevent killer cell - mediated cytoxicity .