Immunohistochemical localization of neurophysin and oxytocin in the sheep corpora lutea.

Antisera raised against neurophysin, oxytocin and vasopressin were used, in conjunction with the immunofluorescence procedure, to localize the neuropeptides in corpora luteal tissue collected from sheep at estrus. Specific immunostaining for neurophysin and oxytocin was observed in all the giant cells of the corpora lutea. In the series of corpora lutea examined staining for vasopressin was not observed.