Muscle-gene edit creates buff beagles

Test of CRISPR gene-editing tool in dogs shows mixed results

CRISPR beagles

BULKING UP  Two beagles named Hercules (left) and Tiangou (right) are the first dogs to have a gene edited with a tool known as CRISPR/Cas9. Researchers mutated the dogs’ myostatin genes to increase the amount of muscle the beagles make.

Qingjian Zou

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