prepare to have your mind blown.
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they changed the voltage gradient of cells in the tadpoles' back and tail to match that of normal eye cells. The eye-specific gradient drove the cells in the back and tail -- which would normally develop into other organs -- to develop into eyes.
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http://www.sciencedaily.com/releases...1207175740.htm
peer-reviewed article:
Vaibhav P. Pai, Sherry Aw, Tal Shormat, Joan M. Lemire. Transmembrane voltage potential controls embryonic eye patterning in Xenopus laevis. Development, December 20, 2011 DOI: 10.1242/dev.073759