Gamma-amino-butyric acid in ocular tissue.

THE existence of γ-amino-butyric acid in the brain tissue was confirmed by Awapara1, and Roberts and Frankel2,3, and it has been identified as an active principle in the inhibitory substance that can be extracted from the mammalian brain4. Its occurrence in ocular tissue has not hitherto been established. The retina, however, can be considered anatomically to be a part of the brain, and from this point of view the retina, choroid, iris and cilliary body have been examined for the presence of γ-amino-butyric acid.