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The N2B27 basal medium in which mouse gastruloids are cultured can either be home-made (HM-N2B27) with materials of known origin, or commercially sourced (NDiff227), where the exact formulation is unknown. In this study, we examined whether these formulations resulted in significant differences in gastruloid development. Our results reveal that while both media enable standard gastruloid elongation, HM-N2B27 gastruloids initiate the elongation process earlier, have a higher number of cells and an increased anterior domain. Despite the maintenance of overall gene expression patterns, RNAseq analysis indicated differences in cell fate specification, with HM-N2B27 gastruloids exhibiting higher expression of spinal cord-related genes, while NDiff227 favours mesodermal differentiation. Furthermore, differential gene enrichment analysis suggests that changes in key signalling pathways underlie the differences between HM-N2B27 and NDiff227 gastruloids. These findings highlight the importance of basal media composition for gastruloid development, underscoring the need for careful media selection during in vitro engineering of stem cell-based embryo models.<\/jats:p>","DOI":"10.1242\/dev.204774","type":"journal-article","created":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T08:35:49Z","timestamp":1764059749000},"source":"Crossref","is-referenced-by-count":2,"title":["N2B27 media formulations influence gastruloid development"],"prefix":"10.1242","volume":"152","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2185-6989","authenticated-orcid":false,"given":"Tina","family":"Balayo","sequence":"first","affiliation":[{"name":"Universitat Pompeu Fabra 1 Department of Medicine and Life Sciences , , Barcelona 08003 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