has role protective antigen role protective antigen Neisseria meningitidis protein NspA from N. meningitidis Allen Xiang NspA-containing outer membrane vesicles conferred protection against otherwise lethal intraperitoneal challenge of mice with N. meningitidis serogroup B, and sera raised against them mediated opsonophagocytosis of meningococcal strains expressing this antigen [PubMed: 15501782]. Oliver He protein Protegen ID: 599; NCBI Protein GI: 5825543; NCBITaxon: 487