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The German medical scientist Paul Ehrlich, 1854- 1915. Ehrlich spent his career in Berlin. He worked with aniline dyes, found how to stain & classify white blood cells, & discovered mast cells which are important in allergy. He invest- igated antitoxins, & his work on antibodies is the basis of modern immunology. He tried to find synthetic chemicals which selectively destroy pathogenic organisms in the body. He discovered that the dye Trypan Red was effective against the parasites which cause trypanosomiasis, and an arsenic compound he called 'salvarsan' could kill the agents of syphilis. This was the beginning of chemotherapy. He shared a Nobel Prize in 1909.
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