A biologically active substance from rabbit irides was isolated [1] that contracted the bovine iris sphincter muscle in vitro and induced miosis when injected into the anterior chamber of cats. [2] ...

Background Central cysts of the iris pigment epithelium, or iris flocculi, are frequently reported in the literature in association with thoracic aortic aneurysm and dissection due to smooth muscle ...

Serotonin and dopamine are neurotransmitters, but each plays a unique role in depression, sleep, digestion, and mood. Learn more here.