1. Organic
and Biomimetic Chemistry Research Group, Ghent University, Krijgslaan
281 S4, B-9000 Ghent, Belgium
2. Department
of Biochemistry, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
3. Equipe
Neuroendocrinologie Moleculaire de la Reproduction, Physiologie de
la Reproduction et des Comportements, Centre INRA Val de Loire, 37380 Nouzilly, France