There are several potassium channel genes in the identified regions that potentially could affect electrolyte and fluid transport: Kcnj9 (chr.1, 94.2 cM), Kcnj10 (chr.1, 93.5 cM), Kcnj5 (chr.9, 11 cM), and Kcnc2 (chr.10, 62 cM).