Anti-mouse ELISA kit to target IFN-γ was purchased from R&D Systems (Minneapolis, MN, USA). Assays were conducted according to the manufacturer's instructions. Plates were read out in Labsystems Multiskan MCC/340 (Fisher Scientific, Suwanee, GA, USA) and data were analyzed using DSJV ELISA software (Fisher Scientific) [21 (link)-24 (link)].