Very interesting. Question: do the eyes induced to grow on extremities actually function? I would imagine that they wouldn't, since the cues and scaffolding that would lead neurons to grow from the eye into the CNS (do flies have optic nerves?) wouldn't be in place in an appendage. Have they tested that? If they did work, that would be pretty cool. You could find a way to breed a new species of insect that saw with its legs.