has role protective antigen role protective antigen Streptococcus pyogenes protein FBP54 Protegen ID: 852; NCBI Nucleotide GI: 496254; NCBITaxon: 1314 Mice subcutaneously or orally immunized with FBP54 survived significantly longer following the challenge with S. pyogenes than did nonimmunized mice [PubMed: 11159987]. Allen Xiang Oliver He protein