Laser light made inside cells
Microscopic implants trap, amplify light, letting researchers track cellular activity
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/07/ag_lasercell_free.jpg?fit=860%2C460&ssl=1)
LASER TAGS Seven of the cells in this micrograph contain lasers in the form of plastic beads (green). The cells are enclosed in red; the nuclei are blue.
Matjaž Humar and Seok-Hyun Yun