Researchers say CRISPR edits to a human embryo worked. But critics still doubt it

Reports that a heart disease–causing version of a gene had been corrected remain contested

human embryos

ALTERED OR NOT?  These human embryos were edited with CRISPR/Cas9 to repair a gene that can cause heart failure. A follow-up study claims to confirm the result, but other scientists contend the embryos might not have been fixed.

Salk Institute

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