 Taurine is an amino acid, which is essential in cat diets due to their low capacity to synthesize it.Taurine has the ability to cross the blood–brain barrier in the brain, it plays a role in many neurological functions, especially in the visual development.Without taurine, felines can have an abnormal morphology in the cerebellum and visual cortex.When cats were fed a diet deficient in taurine, this led to a decrease in the concentration of taurine in the retina of the eye.