Not so CRISP

Ground breaking genetic and biological research these days seems incredibly ripe for claims that have to be soon retracted.  Looks like the successful use of CRISPR technology on human embryos may be one of these:

Doubts have surfaced about a landmark paper claiming that human embryos were cleared of a deadly mutation using genome editing. In an article¹ posted to the bioRxiv preprint server on 28 August, a team of prominent stem-cell scientists and geneticists question whether the mutation was actually fixed.