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[Ultrastructural characteristics of the localization of the enzymes of cyclic nucleotide metabolism in the mammalian brain].

The enzymes involved in cyclic nucleotide turnover (adenylate cyclase, guanylate cyclase, phosphodiesterase) were located in various regions of the brain, in synaptosomes and isolated synaptic membranes, using electron cytochemical methods. The interaction of the above enzymes in the processes of adrenergic and cholinergic cell reception in the CNS are discussed.