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van Keulen LJM, Schreuder BEC, Vromans MEW, Langeveld JPM, Smits MA. Scrapie-associated Prion Protein in the Gastro-intestinal Tract of Sheep with Natural Scrapie. Journal of Comparative Pathology. 1999 Jul;121(1):55–63. doi: 10.1053/jcpa.1998.0300. |