passages.id: split_4_test_3597_passage
passages.type: progene_text
passages.text: Functionally , the KIR3DL1 receptors expressed by five DX9 - positive NK clones were not inhibiting NK - mediated cytotoxicity when tested against the 721.221 B-lymphoblastoid cell line expressing a HLA-B antigen with Bw4 epitope .