Trans-synaptic labeling of central nervous system neurons involved in the innervation of the ovary including the vagus nerve : I. Gerendai,∗ I. E. Tòth,† Zs. Boldogköi,‡ I. Medveczky,§ B. Halász∗. ∗Neuroendocrine Res. Lab., †Joint Res. Lab. Neuromorphology, Semmelweis Univ. Med., and Hung. Acad. Sci. Budapest, ‡Inst. Biochem. Protein Res., Agric. Biotechnol. Ctr., Gödöllö, and §Dept. Microbiol. Infect. Dis., Univ. Vet. Sci., Budapest, Hungary