Fig. 7.

Dose-related Fos-ir expression in the PVH after intramedullary PGE2 injections. Bright-field photomicrographs of section through comparable levels of the PVH show immunoperoxidase localization of Fos-ir seen in response to microinjections of various doses of PGE2 or vehicle. A modest effect is noted at the 10 ng dose, and a much more robust one is noted at 100 ng. dp, Dorsal parvocellular part; mp, medial parvocellular part; pm, posterior magnocellular part;pv, periventricular part; ZI, zona incerta. Magnification, 75×.