I had to laugh at seeing this image in a journal article today. It looked like an alien!! But, it really is an image of a rat after dosing it with a radiolabelled compound. The dark spots show that after the compound was administered orally (head at the bottom), it localizes to the kidneys (the dark eyes in the alien face).
Those are not his Kidneys, Those are his testicles. He just got out of the pool.
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