Key points from article :
Computer model worked out ideal dimensions for a microrobot.
Spiky, porous & spherical best for transporting living cells.
Devices were 3D printed and coated with nickel and titanium.
Magnetic field applied to the animal then leads the microrobots.
Tested in vivo in zebra fish to deliver cells at a specific spot.
Hair-width vehicles could be used in regenerative medicine & cell therapy.
The study was published in the Science Robotics journal.
