[1] Univ Paris 06, Lab Arago, F-66651 Banyuls sur Mer, France
[2] CNRS, UMR 7628, F-66651 Banyuls sur Mer, France
[3] Fac Sci Tanger, Physiol Anim Lab, Tanger, Morocco
[4] Univ Copenhagen, Panum Inst, Inst Med Anat, DK-2200 Copenhagen, Denmark
[5] NICHHD, Sect Neuroendocrinol, Dev Neurobiol Lab, NIH, Bethesda, MD 20892 USA