- Deletion of the Ca2+-activated potassium (BK) alpha-subunit but not the BKbeta1-subunit leads to progressive hearing loss. Rüttiger, L., Sausbier, M., Zimmermann, U., Winter, H., Braig, C., Engel, J., Knirsch, M., Arntz, C., Langer, P., Hirt, B., Müller, M., Köpschall, I., Pfister, M., Münkner, S., Rohbock, K., Pfaff, I., Rüsch, A., Ruth, P., Knipper, M. Proc. Natl. Acad. Sci. U.S.A. (2004)