Explanation :

• Scientists in the United States have named the millimetre-wide robots Xenobots (world’s first living machines) — after the species of aquatic frog found across sub-Saharan Africa from Nigeria and Sudan to South Africa,Xenopus laevis.
• Scientists have repurposed living cells scraped from frog embryos and assembled them into entirely new life-forms.

Application

• The xenobots can move toward a target, perhaps pick up a payload (like a medicine that needs to be carried to a specific place inside a patient) — and heal themselves after being cut.