- Differential subunit composition of the G protein-activated inward-rectifier potassium channel during cardiac development. Fleischmann, B.K., Duan, Y., Fan, Y., Schoneberg, T., Ehlich, A., Lenka, N., Viatchenko-Karpinski, S., Pott, L., Hescheler, J., Fakler, B. J. Clin. Invest. (2004)