Figure 5.

Photomicrographs of lMAN_core from intact photostimulated and photorefractory starlings defined by Nissl stain and enkephalin immunoreactivity. The columns are sequential sections that compare enkephalin immunoreactivity and Nissl stain for the two treatment groups. The rows indicate sections taken from the rostral and caudal regions of lMAN_core. Arrows indicate boundaries used to delineate the volume using enkephalin immunoreactivity and approximated boundaries in Nissl stained sections. Scale bar represents 130 μm.