This picture was featured in this week’s Journal of Neuroscience.
It illustrates ON-RED bipolar cells within the visual cortex, which are important for the integration of light and color.
The second image was taken many many years ago (1991) by my advisor, J. David Glass. Gonadotropin releasing hormone (GnRH), which mediates the release of reproductive hormones (testosterone and estrogen), is localized within the median eminence in the hypothalamus. Get your mind out of the gutter.
The last picture is recent, and was done by my lab mate Jessie. It depicts the localization of Neuropeptide Y within the SCN. This neuropeptide is critically important for the integration of light and nonphotic stimuli (exercise, antidepressants) within the SCN, and the mediatation of feeding within the arcuate nucleus. Again, get your mind out of the gutter.