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Originally Posted by Elspode
It is *extremely* rare for deformities in mammals to be this perfectly symmetrical. I wouldn't be so amazed by a cyclopic cat that had one eye kind of slightly off to one side, sloped a bit or otherwise misshapen, but this one is too *perfect*.
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It probably depends on how early the mutation kicks in. If it happens before the sides differentiate, left and right both receive the same incorrect instructions.