A CRISPR trick in blind mice points the way to possible treatments for inherited diseases

It might seem that scientists have never met a chunk of DNA they couldn’t edit in mice or isolated cells using CRISPR — from mutations causing deafness to those for Duchenne muscular dystrophy.  In fact, they are learning what every pencil- or Word-wielding editor knows: It’s much easier to improve something that’s in terrible shape than writing that’s near perfect.

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