CD8A and tuberculosis: Several other mycobacterial antigens, previously described as important for vaccine development and TB diagnosis, have also been identified in the present study, including the ESAT-6 like protein EsxG (Rv0287, BCG0327), recognized by multiple T-cell lines and able to boost IFN-γ levels in mouse and guinea pig models of TB [61], and the secreted MPT51 protein (Rv3803c, BCG3865c), described as being able to induce higher levels of antigen-specific CD8+ T-cell responses [62].