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Methodological and technical problems of the autoradiographic-neuroanatomical tracing (ARNT) technique are discussed. The size of the labeled area after a tritiated amino acid injection varies directly with the volume of isotope, the rate of injection, and the length of exposure of the secretion to the emulsion. Frozen sections can be used for autoradiography if they are mounted on subbed slides, dehydrated in ethanol, defatted for 1 hour in xylene, rehydrated through ethanol and water, and dried before coating with emulsion.
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