passages.id: split_6_test_2970_passage
passages.type: progene_text
passages.text: Further phylogenetic analysis of the KIR sequences after removal of confounding recombined segments showed that only two KIR genes , KIR2DL4 and KIR2DL5 , have been preserved throughout hominoid evolution , and one of them , KIR2DL4 , is also common to rhesus monkey and hominoids .