CD4 and tuberculosis: Among GM-CSF-producing T cells in mouse lungs, nonconventional T cells (i.e., invariant NKT [iNKT] cells and γδ T cells) vastly outnumber conventional T cells (CD4+ and CD8+ T cells) during the first 2 weeks postinfection; during later TB stages, conventional T cells are more represented among GM-CSF producers.