Tweaking one gene with CRISPR switched the way a snail shell spirals

The first gene-edited snails confirm which gene is responsible for how a shell swirls

pond snails

MIRROR IMAGE Tweaking a gene with the gene editor CRISPR/Cas9 caused the shells of pond snails that normally coil to the right (top) to twist to the left (bottom).  

Courtesy Kuroda Lab

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