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Once the basic shape of the eye is specified, cells within the optic cup differentiate, populating the retina with neurons that sense light and refine visual information before it is transmitted to the brain. In fish and amphibians, retinal stem cells are maintained throughout the animal’s lifetime in a stem cell niche located adjacent to the lens (seen in yellow above). This situ hybridization image of a zebrafish eye (from a ~3-day-old larvae) reveals gene expression patterns that distinguish retinal stem cells (red) from the cells that are becoming neurons (purple). By comparing gene expression patterns within the retinal stem cell niche in normal and mutant eyes, we gain insight into how stem cells turn into neurons.
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Hunterian Museum - Royal College of Surgeons - London. I feel oddly at peace here, it’s so fascinating.
Definitely one of my favourite museums
Posted on March 18, 2012 via Anaesthetic Room. with 21 notes
Source: sweetnortheast
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Leechdoms, wortcunning, and starcraft of early England - being a collection of documents, for the most part never before printed, illustrating the history of science in this country before the Norman conquest collected and edited by Oswald Cockayne
Scanned versions are available at archive.org:
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Posted on January 13, 2012 via Pre-Apocalypse Mondo with 3,122 notes
Source: sievetronix

