1. Departments of Physiology and Biophysics (P.B.-S., R.M.R., F.G.-S., E.L.B., M.T.N.), Institute of Biomedical Sciences, University of São Paulo, CEP 05508–900, São Paulo SP, Brazil
2. Departments of Cell and Developmental Biology (R.d.M.S., T.M.T.Z.), Institute of Biomedical Sciences, University of São Paulo, CEP 05508–900, São Paulo SP, Brazil