passages.id: split_6_test_1385_passage
passages.type: progene_text
passages.text: Human killer - cell immunoglobulin - like receptors ( KIR ) show three types of organization of their extracellular domains : D0-D1-D2 in KIR3D , D1-D2 in the majority of KIR2D , and D0-D2 in KIR2DL4 and the novel KIR2DL5 .