The work is based on Japanese Nobel Laureate Shinya Yamanaka's eponymous Yakanama Factors, four genes that can rewind any adult cell all the way back to a stem-cell state. The problem is, a reset retina cell forgets it's a retina cell. So Life Bio uses three of the four factors (dropping c-Myc, the one most tied to cancer) and nudges the cells only partway back: younger, but still themselves.
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