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This April 2019 photo provided by Audrey Velasco-Hogan shows a dragonfish during a specimen collection session along the coast of San Diego, Calif. The deep-sea creature's teeth are transparent underwater - virtually invisible to prey. According to research released on Wednesday, June 5, 2019, they are made of the same materials as human teeth, but the microscopic structure is different. And as a result, light doesn’t reflect off the surface. (Audrey Velasco-Hogan via AP)

This April 2019 photo provided by Audrey Velasco-Hogan shows a dragonfish during a specimen collection session along the coast of San Diego, Calif. The deep-sea creature's teeth are transparent underwater - virtually invisible to prey. According to research released on Wednesday, June 5, 2019, they are made of the same materials as human teeth, but the microscopic structure is different. And as a result, light doesn’t reflect off the surface. (Audrey Velasco-Hogan via AP)

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