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Boundary loss is preceded by changes in segmental expression of Krox-20 and Cek-8 and followed by alterations in Hox gene expression. The characteristic morphology of boundary cells, their expression of follistatin and the periodic accumulation of axons normally associated with boundaries are all lost. In the absence of boundaries, we detect no change in anteroposterior dispersal of precursor cells and, in most cases, no substantial cell mixing between former rhombomeric units. This is consistent with the idea that lineage restriction can be maintained by processes other than a mechanical barrier composed of boundary cells. Much of the early organisation of the motor nuclei appears normal despite the loss of boundaries and altered Hox expression.<\/jats:p>","DOI":"10.1242\/dev.124.12.2297","type":"journal-article","created":{"date-parts":[[2021,4,23]],"date-time":"2021-04-23T19:12:40Z","timestamp":1619205160000},"page":"2297-2306","source":"Crossref","is-referenced-by-count":42,"title":["Cell movements, neuronal organisation and gene expression in hindbrains lacking morphological boundaries"],"prefix":"10.1242","volume":"124","author":[{"given":"Ronald","family":"Nittenberg","sequence":"first","affiliation":[{"name":"University College London 1 Department of Anatomy and Developmental Biology , , Medawar Building, Gower Street, London WC1E 6BT, UK"},{"name":"University College London 2 Department of Molecular Pathology , , Windeyer Building, Cleveland Street, London W1P 6DB, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ketan","family":"Patel","sequence":"additional","affiliation":[{"name":"University College London 1 Department of Anatomy and Developmental Biology , , Medawar Building, Gower Street, London WC1E 6BT, UK"},{"name":"National Institute of Medical Research 3 Division of Developmental Neurobiology , , Mill Hill, London NW7 1AA, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yogish","family":"Joshi","sequence":"additional","affiliation":[{"name":"University College London 1 Department of Anatomy and Developmental Biology , , Medawar Building, Gower Street, London WC1E 6BT, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robb","family":"Krumlauf","sequence":"additional","affiliation":[{"name":"National Institute of Medical Research 3 Division of Developmental Neurobiology , , Mill Hill, London NW7 1AA, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David G.","family":"Wilkinson","sequence":"additional","affiliation":[{"name":"National Institute of Medical Research 3 Division of Developmental Neurobiology , , Mill Hill, London NW7 1AA, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul M.","family":"Brickell","sequence":"additional","affiliation":[{"name":"University College London 2 Department of Molecular Pathology , , Windeyer Building, Cleveland Street, London W1P 6DB, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cheryll","family":"Tickle","sequence":"additional","affiliation":[{"name":"University College London 1 Department of Anatomy and Developmental Biology , , Medawar Building, Gower Street, London WC1E 6BT, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jonathan D. 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