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Image 14 of 15:  Undated, circa 1955
Emil Witschi in his University of Iowa laboratory. The amphibian on Witschi's left arm is a male bullfrog. Witschi often used frogs and toads in his research, beginning with his 1913 dissertation.

1955est-Emil-Witschi-in-lab-with-Xenopus-toad.jpg

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