Hi, yes l could recommend an antibody to the GIRK4 protein encoded by the Kcnj5. I would probably recommend either the Anti-GIRK4 (KCNJ5) antibody from Abcam or the Anti-KCNJ5/GIRK4 antibody from CST. Both of these antibodies are specific for the GIRK4 protein, which is encoded by the Kcnj5 gene.