Key CRISPR gene editing methods might not work for most humans

The potential reaction isn’t shocking. Both Cas9 variants are based on common bacteria, S. aureus and S. pyrogenes, that tend to infect humans. However, that could also produce reactions that would be… unpleasant. At the least, they could “hinder the safe and effective use” of CRISPR to treat disease. And in the worst cases, they …

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