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Summary. The adrenal medullas of cats and rats were stimulated via the splanchnic nerves by means of injections of morphine and insulin, respectively. In both types of experiment stimulation resulted in a drop in the ATP content of the adrenal medulla, the percentage decrease being the same as for the catechol amine content. During stimulation ATP and the catechol amines are released from the adrenal medullary granules, which remain in the medullary cells, probably essentially intact.
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Carlsson et al. (1956) studied this question.
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