1. School of Biotechnology, Division of Molecular Biotechnology, Royal Institute of Technology, AlbaNova University Center, SE − 106 91 Stockholm, Sweden, School of Biotechnology, Division of Proteomics, Royal Institute of Technology, AlbaNova University Center, SE − 106 91 Stockholm, Sweden, and Affibody AB, Box 20137, SE − 161 02 Bromma, Sweden