[1] CNRS,PHYSIOL COMPAREE REGULAT LAB,F-67000 STRASBOURG,FRANCE
[2] NETHERLANDS INST BRAIN RES,AMSTERDAM,NETHERLANDS
[3] UNIV AMSTERDAM,DEPT ANAT & EMBRYOL,AMSTERDAM,NETHERLANDS
[4] INRA,NEUROENDOCRINOL SEXUELLE LAB,F-37380 NOUZILLY,FRANCE
[5] UNIV SURREY,DEPT CLIN BIOCHEM,GUILDFORD GU2 5XH,SURREY,ENGLAND
[6] MCMASTER UNIV,DEPT NEUROSCI,HAMILTON L8S 4L8,ONTARIO,CANADA