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Distribution of Guanine Deaminase in Mouse Brain

Guanine deaminase was measured in nearly 100 different areas of mouse brain. The levels are relatively high in all parts of the telencephalon, both gray and white. It is especially active in parts of the olfactory tubercle and amygdala. Levels in the diencephalon range from low to as high as in the telencephalon. Brain areas caudal to the diencephalon, including all parts of the cerebellum, are almost uniformly below the level of detection. The enzyme is also virtually absent from the retina. The extreme range of concentration suggests that guanine deaminase might play a role in the metabolism of a neuroeffector.