filamentous phage display p8 filamentous phage display MI:0900 PSI-MI high valency display pVIII is the major coat protein of filamentous phage. Its amino-terminus is exposed to solvent and tolerates the insertion of relatively large peptide fragments. By inserting the peptide coding sequence into the phage copy of the pVIII gene up to 3000 copies of the hybrid proteins can be displayed along the phage capsid. Alternatively the hybrid protein can be encoded on a phagemid that is incorporated in a virus like particle by infection with a helper phage. In this latter case one obtains a chimeric capsid where hybrid proteins are interspersed at different density in an otherwise wild type coat. Because of the high copy number pVIII display is also referred to as high valency display. p8 filamentous phage