passages.id: split_4_test_1275_passage
passages.type: progene_text
passages.text: Although not observed on native gels , the inhibitory receptor KIR2DL1 can be chemically cross - linked into dimers in the presence of Zn(2+) and its related divalent metal ions , suggesting that Co(2+) - mediated dimerization of KIR2DL1 may mimic a weaker interaction between KIR2DL1 and zinc in vivo .