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Nevertheless, peripheral tissues have also been reported to express oxytocin. Using systemic injection of a recombinant adeno\u2010associated virus vector, we investigated the expression of the green fluorescent protein Venus under the control of the oxytocin promoter in the gastrointestinal tract, pancreas and testes of adult rats. Here, we confirm that the vector infects oxytocin neurones of the enteric nervous system in ganglia of the myenteric and submucosal plexuses. Venus was detected in 25%\u201060% of the ganglia in the myenteric and submucosal plexuses identified by co\u2010staining with the neuronal marker PGP9.5. Oxytocin expression was also detected in the islets of Langerhans in the pancreas and the Leydig cells of the testes. Our data illustrate that peripheral administration of the viral vector represents a powerful method for selectively labelling oxytocin\u2010producing cells outside the brain.<\/jats:p>","DOI":"10.1111\/jne.12970","type":"journal-article","created":{"date-parts":[[2021,4,15]],"date-time":"2021-04-15T00:59:59Z","timestamp":1618448399000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Identification of peripheral oxytocin\u2010expressing cells using systemically applied cell\u2010type specific adeno\u2010associated viral vector"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3037-2756","authenticated-orcid":false,"given":"Luis","family":"Paiva","sequence":"first","affiliation":[{"name":"Centre for Discovery Brain Sciences University of Edinburgh Edinburgh 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