Meet Frank and Louie! He's a cat with two faces, and last year he entered the Guinness World Records as the longest surviving cat with this condition. Male cats with this are referred to as "Janus cats", after the Roman god Janus. Janus cats appear to be conjoined twins, but their condition is actually known as Diprosopus and is the result of a protein called sonic hedgehog homolog (SHH). Yes, there's a protein called the sonic hedgehog protein.

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