1. Centre National de la Recherche Scientifique, UPR 9042, Station Biologique, Place G. Teissier, B. P. 74, 29682 Roscoff cedex, France
2. University Laboratory of Physiology, Parks Road, Oxford OX1 3PT, UK
3. INSERM U511, CHU Pitié‐Salpêtriére, 91 Bd. de l'Hôpital, 75634 Paris cedex 13, France