Photo: Sharks' Electro-Sensing Organs Linked to Human Features?

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The dark markings in the shark embryo pictured above indicate gene expression in the electro-sensory organs in the animal's head. University of Florida researchers traced the origin of a shark's electro-sensory powers to the same type of embryonic cell that gives rise to many head and facial features in humans.

Photograph © 2006 Renata Freitas/University of Florida

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