1. From the SDSU Heart Institute, Department of Biology (N.A.G., F.F., K.M.B., K.I., K.P.N., C.R.P., V.S., M.M.M., A.R.C., F.G.K., B.J.W., D.E.E., R.A., M.A.S.)
2. San Diego State University, CA; Sharp Memorial Hospital, San Diego, CA (W.P.D.)
3. SDSU Department of Mathematics and Statistics (B.A.B.)
4. Department of Medicine, University of Minnesota, Minneapolis (J.v.B.).