For the analysis of the IL-15 BV or IL-15 BV + IL-15Rα BV infection in the absence of GFP, the secreted IL-15 protein or the complex were quantitated by IL-15 monomer-specific or IL-15:IL-15Rα complex-specific ELISA kits (Figure 2C,D). The gene discussed is IL15RA; the disease is infection.