it has a different representation of what to do if it gets injured in the future. It's a latent memory. It doesn't do anything until it gets injured. It just sits there and you would have no idea that it's there by looking at the at the anatomy. But if it's get if it gets injured, this is what its idea of a correct worm.
for - adjacency - stored latent memory of future morphology - can be altered - Michael Levin - potential progress trap