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Abstract
The immune system is subject to an array of identified autoregulatory processes, but immunoregulation may also have a further basis in a network of immune‐neuroendocrine interactions. Two antigens each produced an increase of more than 100 % in electrical activity of individual neurones in the ventromedial but not in the anterior nucleus of the rat hypothalamus. Animals that failed to respond to antigen manifested no increase in the firing rate. These findings constitute the first evidence for a flow of information from the activated immune system to the hypothalamus, suggesting that the brain is involved in the immune response.

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