 The presence of nucKATP was confirmed by the discovery that isolated patches of nuclear membrane possess properties, both kinetic and pharmacological, similar to plasma membrane KATP channels.Four genes have been identified as members of the KATP gene family.The "sur1" and "kir6.2" genes are located in chr11p15.1 while "kir6.1" and "sur2" genes reside in chr12p12.1.