Mutated azalea

This azalea grows outside a bedroom window. My wife took the picture from inside the house, while I tried to hold a branch out of the way, so that the main reason for the picture would be visible. That reason is that there is a branch that has flowers that are obviously a lighter color than the rest of the bush. This is probably due to some sort of mutation. "Sports" like this have been used to develop many new varieties of plants.