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Electrophoretic profiles and antibody labeling of atypical proteinase K–resistant prion protein (PrPres) detected with monoclonal antibodies Sha31 (A) and 12B2 (B) in different isolates used for inoculating porcine PrP transgenic mice. Panels A and B were loaded with the same quantities of extracted PrPres from each sample. MW, molecular mass in kilodaltons.
