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Claude Bernard performing a vivisection experiment on a dog with his students, including Paul Bert

Among the students is Paul Bert (back row, third from left). (From a photogravure of the picture of 1889 by Leon L'Hermite in the Sorbonne. Creative Commons 4.0 International License [CC BY 4.0], https://creativecommons.org/licenses/by/4.0/legalcode.)