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Law and Constantine-Paton transplanted eye primordia between tadpoles to create three-eyed frogs.

The additional eyes connected to the frogs' contralateral tecta and created competition of inputs which is not usually present in frogs (where the optic chiasm is perfect).

The result were tecta in which alternating stripes are responsive to input from different eyes.

Similar results result if one of the tecta is removed and both natural retinae project to the remaining tectum.