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Sheep (\n                    <jats:italic>Ovis aries<\/jats:italic>\n                    ) is well known as a pre\u2010clinical model in therapeutic studies, such as extra\u2010uterine support. The aim of our study was to investigate the relevance of the lamb as a pre\u2010clinical model for preterm birth when cortical maturation of preterm and term lamb is addressed. Cesarean sections were performed on time\u2010dated pregnant ewes to obtain 13 lambs at 100 days and 140 days of pregnancy each (corresponding to 24 and 36 weeks of pregnancy in humans, respectively). Brains were collected and separated in frontal lobe, temporo\u2010parietal lobe, occipital lobe, and cerebellum. Immunohistochemistry staining was used for each brain area by targeting neurons, interneurons, synaptic vesicles, oligodendrocytes, myelin, astrocytes, and microglia. Quantifications were normalized by the surface area of analysis. Overall, 140\u2010days late preterm lambs have significantly higher mean positivity for interneurons, synaptic vesicles, oligodendrocytes, astrocytes, and myelin than 100\u2010days extremely preterm lambs. Similarly, significantly higher mean positivity for neurons was found in the cerebellum of 140\u2010days term lambs. No significant difference was observed regarding microglia. Based on the cellular and structural markers used in this study, brain development in lamb seems to follow an antero\u2013posterior direction similarly to what was reported in humans. Further studies with more specific markers and in\u2010depth analysis will allow for a more accurate and exhaustive description of brain development in lamb.\n                  <\/jats:p>","DOI":"10.1002\/cne.70149","type":"journal-article","created":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T07:45:46Z","timestamp":1774338346000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Ovine Brain as a Model for Human Neurodevelopment: Immunohistochemical Profiling of Brain Maturation Markers in Preterm Lambs"],"prefix":"10.1002","volume":"534","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0315-1210","authenticated-orcid":false,"given":"Yoann","family":"Rodriguez","sequence":"first","affiliation":[{"name":"Universit\u00e9 Paris\u2010Saclay, UVSQ, Inserm, IMPROVE  Versailles France"},{"name":"Universit\u00e9 Paris\u2010Saclay, UVSQ, INRAE, BREED  Jouy\u2010en\u2010Josas 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