[1] Univ Hosp NS Candelaria, Div Res, Tenerife, Spain
[2] Univ La Laguna, Dept Physiol, Tenerife, Spain
[3] Univ Med & Dent New Jersey, Newark, NJ 07103 USA
[4] Yale Univ, Sch Med, Dept Cellular & Mol Physiol, New Haven, CT 06510 USA
[5] NINDS, NIH, Bethesda, MD 20892 USA