{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T13:02:54Z","timestamp":1774616574446,"version":"3.50.1"},"reference-count":56,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2004,10,9]],"date-time":"2004-10-09T00:00:00Z","timestamp":1097280000000},"content-version":"vor","delay-in-days":6303,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Comparative Neurology"],"published-print":{"date-parts":[[1987,7,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The distribution of methionine\u2010enkephalin\u2010Arg<jats:sup>6<\/jats:sup>\u2010Gly<jats:sup>7<\/jats:sup>\u2010Leu<jats:sup>8<\/jats:sup>, a unique peptide derived from proenkephalin A in the rat brainstem, was studied immunocytochemically by using a highly specific antiserum to this octapeptide sequence.<\/jats:p><jats:p>Immunoreactive perikarya with various shapes and sizes were detected in many regions of the rat brainstem. Dense accumulation of immunoreactive perikarya and fibers was seen in the nuclei associated with special sensory and visceral functions, such as the interpeduncular nucleus, the parabrachial nucleus, the nucleus of the solitary tract, and the nucleus of the spinal tract of the trigeminal nerve. Clusters of methionine\u2010enkephalin\u2010Arg<jats:sup>6<\/jats:sup>\u2010Gly<jats:sup>7<\/jats:sup>\u2010Leu<jats:sup>8<\/jats:sup>\u2013like immunoreactive perikarya and fibers were observed in certain areas considered to play a role in nociception and analgesia, such as the central gray of the midbrain central gray and the raphe magnus nucleus. Some methionine\u2010enkephalin\u2010Arg<jats:sup>6<\/jats:sup>\u2010Gly<jats:sup>7<\/jats:sup>\u2010Leu<jats:sup>8<\/jats:sup>\u2010like immunoreactive perikarya were distributed in the lateral reticular nucleus, the nucleus of the solitary tract, and the raphe magnus nucleus, where monoaminergic neurons were also detected. In addition to the previously reported enkephalinergic cells, we found many methionine\u2010enkephalin\u2010Arg<jats:sup>6<\/jats:sup>\u2010Gly<jats:sup>7<\/jats:sup>\u2010Leu<jats:sup>8<\/jats:sup> containing neurons; the rostral and caudal linear nucleus of raphe, the median raphe nucleus, entire length of the raphe magnus nucleus, the medial longitudinal fasciculus, the cuneate nucleus, the external cuneate nucleus, the gracile nucleus, and the area postrema. The wide distribution of this octapeptide\u2010like immunoreactivity reflected neurons expressing the preproenkephalin A gene distributed more widely than previously reported and that innervated many regions.<\/jats:p>","DOI":"10.1002\/cne.902610203","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T20:31:10Z","timestamp":1104611470000},"page":"193-208","source":"Crossref","is-referenced-by-count":52,"title":["Immunocytochemical distribution of met\u2010enkephalin\u2010Arg<sup>6<\/sup>\u2010Gly<sup>7<\/sup>\u2010Leu<sup>8<\/sup> in the rat lower brainstem"],"prefix":"10.1002","volume":"261","author":[{"given":"Sadatsugu","family":"Murakami","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hitoshi","family":"Okamura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chizuko","family":"Yanaihara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Noboru","family":"Yanaihara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuhiko","family":"Ibata","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.ne.07.030184.001255"},{"key":"e_1_2_1_3_1","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1016\/0006-8993(84)90150-1","article-title":"Enkephalin\u2010like immunoreactivity in rat area postrema: Ultrastructural localization and coexistence with serotonin","volume":"310","author":"Armstrong D. 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