Eye cells from cells to help repair macular degeneration. (http://onlinelibrary.wiley.com/doi/10.1002/stem.635/abstract)
QuoteRecently, RPE cells were generated from hiPS cells. However, there is no evidence that those hiPS-derived RPE possess specific RPE functions that fully distinguish them from other type of cells.
Not only are they not sure whether the new RPE cells will do what they're supposed to do for humans, but they've also found that the RPE cells die faster than they should, which they think is a result from the process of turning skin cells into eye cells. Despite not yet having solved the problems that prevent this from working on people, this is some cool shit.