Image 1. Three examples of the tissue shapes the team created. The black and white square, circle and triangle on the left correspond to the cells that were illuminated. On the right, three fruit fly ...

Image 2. Example of optogenetics-guided tissue folding. The top image shows an embryo 10 minutes after illumination, and the bottom one 13 minutes afterwards: light-activated cells have folded inwards ...

Researchers have resolved a 50-year-old scientific mystery by identifying the molecular mechanism that allows tissues to ...