passages.id: split_1_test_2554_passage
passages.type: progene_text
passages.text: Regarding KIR2DL5 , four groups of KIR haplotypes can be distinguished : those having both KIR2DL5A and KIR2DL5B , those having either KIR2DL5A or KIR2DL5B , and those lacking KIR2DL5 .