Two types of "inclusions" observed in the neurons of the hypothalamic paraventricular nucleus of the turtle Mauremys caspica, "tubular systems" and "fingerprint-like" structures, may be added to the inventory of those described in apparently normal neurons. Despite their enigmatic significance, we are inclined to think that they could be a morphological expression of viral diseases in the neuron cytoplasm. These structures have a striking similarity with those observed on pathological cells (hepatitis and SIDA).
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