... from the cell body to the axon terminal in the sinus gland, as a result of late and progressiveisomerization of the Phe3 of the CHH during the migration of the secretion vesicles along the axonaltract ... microscopystudy of the neuronal endings in the sinus gland todetermine the subcellular localization of the differentepimers. Taken together, these results allow a discus-sion of the existence of enzyme(s) ... 4G).DiscussionAlthough the existence of two VIH isoforms with iden-tical sequence, molecular mass and isoelectric pointhas been known for more than 15 years [22], the nat-ure of the difference between the two...