AVNT - Luginbühl,B.; Kanyo,Z.; Jones,R.M.; Fletterick,R.J.; Prusiner,S.B.; Cohen,F.E.; Williamson,R.A.; Burton,D.R.; Plückthun,A. - Directed evolution of an anti-prion protein scFv fragment to an affinity of 1 pM and its structural interpretation - Journal of Molecular Biology 2006 Oct 13; 363(1): 75-97