T2 showed a more uniform distribution in cerebral cortex and subcortical nuclei of an apparently lesser amount of Pr[P.sup.D]; T3 appeared to preferentially affect the hemispheric white matter and other subcortical regions such as the alveus, the corpus callosum, the anterior commissure, and fascicles surrounding thalamus as well as other white matter formations such as fimbria,
brachium of superior colliculus, medial lemniscus, and cerebral peduncles.