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P. Ehrlich. Paul Ehrlich (1854-1915), German immunologist, bacteriologist and chemtherapist. Ehrlich worked with aniline dyes, developing methods to stain white blood cells and discovered a new variety called 'mast cells'. Ehrlich also studied immunology and diseases; in 1892 he helped to develop the diphtheria antitoxin. He investig- ated 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 called 'salvarsan' against syphilis. This was the beginning of chemotherapy. He shared a Nobel Prize for medicine in 1908.
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