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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/05/051319_ti_snails_feat.jpg?fit=860%2C460&ssl=1)
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