Organ transplants are a well-known concept. Organelle transplants, much less so. But organelles are to cells what organs are to our bodies—specialised elements that divvy up the labour wanted to maintain the entire thing ticking over. Swapping previous organelles for brand new in cells the place the equipment has switched from ticking to tocking thus is sensible in precept. And, for one sort of organelle, that precept is now being examined in follow.