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Bed of Roses
18 March 2012

Bed of Roses

Many mothers will agree that parenthood is not a bed of roses. Yet bench scientists may argue that we do in fact spawn from something akin to a field of rosettes. When embryonic stem cells are cultured in vitro, those developing along the neural [brain] pathway form the characteristic rosette structures pictured. Columnar ‘whorls’ of cells (nuclei stained blue) arrange themselves radially in ‘floral’ bundles. More developed neurons are forming around the outside (green). In vivo, stem cells in the embryo are guided to different developmental fates through molecular gradients that are generated along the body axis, from tip to toe. The neural rosette is the developmental signature of immature neurons in culture, but whether these structures actually form in the womb is not known. Similar structures are characteristic of certain brain tumours, including medulloblastoma. Understanding how stem cells differentiate is critical to the success of regenerative medicine.

Written by Brona McVittie

  • Image Courtesy of Charles Arber

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BPoD stands for Biomedical Picture of the Day. Managed by the MRC Laboratory of Medical Sciences until Jul 2023, it is now run independently by a dedicated team of scientists and writers. The website aims to engage everyone, young and old, in the wonders of biology, and its influence on medicine. The ever-growing archive of more than 4000 research images documents over a decade of progress. Explore the collection and see what you discover. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

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