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Reptiles provide an excellent system in which to investigate the neural mechanisms of social living. Using immunohistochemistry, we compare distributions of these transmitters in two skinks differing primarily in social ecology: the family\u2010living\n                    <jats:italic>Liopholis whitii<\/jats:italic>\n                    and the solitary\n                    <jats:italic>Eulpamrus quoyii<\/jats:italic>\n                    . We describe patterns of immunopositive signal for both cell bodies and fibers across the entire brain (excluding the olfactory bulbs). In both species, vasotocin and oxytocin were found in the preoptic area, paraventricular nucleus, supraoptic nucleus, dorsomedial hypothalamus, and supraoptic decussation, as well as surrounding the lateral forebrain bundle. Tyrosine hydroxylase (a marker for dopamine) was found in the paraventricular organ nucleus, substantia nigra, and ventral tegmental area, and serotonin was found in the raphe nuclei and superior reticular field. We found novel oxytocin cell groups in the dorsomedial hypothalamus and cerebellum of\n                    <jats:italic>L. whitii<\/jats:italic>\n                    , and novel serotonin signal in the red nucleus of\n                    <jats:italic>E. quoyii<\/jats:italic>\n                    . Immunopositive signals found only in\n                    <jats:italic>L. whitii<\/jats:italic>\n                    also include vasotocin in the ventral tegmental area, tyrosine hydroxylase in the interpeduncular nucleus, and serotonin in the suprachiasmatic nucleus. The qualitatively greater abundance of these transmitters in the family\u2010living\n                    <jats:italic>L. whitii<\/jats:italic>\n                    suggests that these molecules may have played an important role in the evolution of social behavior in these skinks and provides a foundation for broader comparisons across the social skinks.\n                  <\/jats:p>","DOI":"10.1002\/cne.70184","type":"journal-article","created":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T16:03:23Z","timestamp":1784563403000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Neural Distribution of Vasotocin, Oxytocin, Dopamine, and Serotonin in Two Australian Skinks With Contrasting Social Lives"],"prefix":"10.1002","volume":"534","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-0111-1008","authenticated-orcid":false,"given":"Jai","family":"Lake","sequence":"first","affiliation":[{"name":"School of 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