CD8A and infection: To assess whether the maturation of DCs by GrpE is reflected in their ability to specifically stimulate CD4+ and CD8+ T cells from the spleens of Mtb H37Rv-infected mice at 8 week's post-infection, we examined the expression of the memory T cell markers CD62L and CD44 on the surface of CD4+ and CD8+ T cells using flow cytometry.