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Sir Joseph Lister (English) and Sir William Macewen (Scottish), pioneers in the use of exogenous collagen in medicine.2,3,1 The image of Lister is from an oil painting by Walter William Ouless (courtesy of the Wellcome Library, London); the image of Macewen is from an oil painting by Charles R. Dowell (courtesy of the Royal College of Physicians and Surgeons of Glasgow). The catgut in oil was prepared by Lister in 1875 (courtesy of King's College London).
