The expression of various genes in the<unk>  have been studied. For example, it was seen that water deprivation in rats led to an upregulation of the mRNA that codes for angiotensin II receptors, allowing for a lower angiotensin concentration in the blood that produce the "thirst" response. It also has been observed to be a site of thyroid transcription factor 1 (TTF1) production, a protein generally produced in the hypothalamus.
Subfornical organ
Stellate ganglion
Meibomian gland
Olfactory trigone
Syrinx 
Medulla 
Medulla
Aorticorenal ganglion