Researchers are discovering that mitochondria (blue), known as cells’ power plants, also play parts in cells’ immune responses. Credit: David M. Phillips/Science Photo Library

When a parasite invades a cell, the cell’s mitochondria react by shedding their outer layers to form brand-new cellular compartments — or organelles — that digest molecular trash.

Cells are swapping their mitochondria. What does this mean for our health?

The team that made the discovery showed that when the mitochondria — best known as cells’ energy producers — form these organelles, it helps the parasite to proliferate, although it isn’t clear exactly how.…