has role protective antigen role protective antigen Coccidioides spp. protein GEL1.00 Oliver He protein Protegen ID: 799; NCBI Protein GI: 14582416; NCBITaxon: 199306 The GEL1 mRNA of C. posadasii was detected at the highest level during the endosporulation stage of the parasitic cycle, and the mature protein was immunolocalized to the surface of endospores. BALB/c or C57BL/6 mice were immunized subcutaneously with the bacterium-expressed recombinant protein (rGel1p) to evaluate its protective efficacy against a lethal challenge of C. posadasii by either the intraperitoneal or intranasal route. In both cases, rGel1p-immune mice infected with the pathogen showed a significant reduction in fungal burden and increased survival compared to nonimmune mice [PubMed: 12761077]. Allen Xiang