Johannes Holtfreter, embryologist

Johannes Holtfreter, embryologist

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Credit: AMERICAN PHILOSOPHICAL SOCIETY/SCIENCE PHOTO LIBRARY

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Caption: Johannes Holtfreter (1901-1992), German-American embryologist and developmental biologist, holding two alligators. Holtfreter is best known for his work on the 'organizer', the cluster of cells in an embryo that induces the development of the central nervous system.

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