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To elucidate the effect of traumatic stress on the lateral habenular nucleus, we investigated the time course of the expression of c-Fos protein in this nucleus of the Japanese monkey (Macaca fuscata) after enucleation of one eye using c-Fos protein immunocytochemistry. c-Fos protein-like immunoreactive neurons were significantly increased; the increase started 1 h after the enucleation and remained high for 3–9 h in the lateral habenular nucleus on both sides. These results suggest that the prolonged expression of c-Fos protein occurred in the lateral habenular nucleus after traumatic stress through multiple transsynaptic activations.

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