HowStuffWorks Videos "Human Mutants: Janus Faced Twins"

Human Mutants: Janus Faced Twins

On Discovery Channel's "Human Mutants: The Mystery of Growth," learn about a rare type of conjoined twins called cephalothoracoiliopagus or Janus-faced twins.

Tags: conjoined twins, siamese twins, birth defect, human mutants, discovery channel

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