STEP 4: PUT THE STEM CELLS IN THE RIGHT PLACE

Delivering stem cells to the damaged tissue will usually require a surgical procedure. This procedure must get stem cells to their target destination while causing no further injury to the recipient.

Surgeons placed the cells into the brains of patients by drilling small holes in the skull and injecting the cells through a needle. They used precise imaging procedures to ensure that the injections reached the correct place in the brain.