- Design of a potent and selective inhibitor of the intermediate-conductance Ca2+-activated K+ channel, IKCa1: a potential immunosuppressant. Wulff, H., Miller, M.J., Hansel, W., Grissmer, S., Cahalan, M.D., Chandy, K.G. Proc. Natl. Acad. Sci. U.S.A. (2000)