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Immunofluorescence for Fos protein in neurons of brain of mice. Dorsal raphe nucleus (a, b, c, and d), locus coeruleus (e, f, g, and h), trigeminothalamic tract (i, j, k, and l), and trigeminal nucleus (m, n, o, p) ninety minutes after treatment and 30 minutes after algesic induction with formalin. 20 μm.
