2Taylor J P,Hardy J,Fischbeck K H.Toxic proteins in neurodegenerative disease[].Science.2002
3Alper,T,Cramp,W.A,Haig,D.A.et al.Does the agent of scrapie replicate without nucleic acids?[].Nature.1967
4Vaccaria G,Contea ML,Morellia G,Di Guardo G,Pet-raroli R,Agrimi U.Primer extension assay for prion pro-tein genotype determination in sheep[].Molecular and Cellular Probes.2004
5Tranulis M A.Influence of the prion protein gene,Prnp,onscrapie susceptibility in sheep[].Acta Pathologica Microbiologica et Immunologica Scandinavica.2002