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German scientist (1854–1915) who pioneered (and coined the term) chemotherapy and, in his research on a cure for syphilis, developed the ‘magic bullet’ concept of selectively targeting a disease-causing organism. Vintage 3.25 x 5.25 German postcard photo, signed in fountain pen, “P. Ehrlich.” In very good condition, with moderate silvering working in from all four edges and some scattered trivial edge dings. RRAuction COA.