Conversion of a-helices into b-sheets features in the formation of the scrapie prion proteins. - Pan,K-M.; Baldwin,M.; Nguyen,J.; Gasset,M.; Serban,A.; Groth,D.; Mehlhorn,I.; Huang,Z.; Fletterick,R.J.; Gohen,F.E.; Prusiner,S.B. (Proc Natl Acad Sci USA, 1993)