SLC40A1 and infection: Interestingly, 48 hours after infection, 75.8 ± 0.02% of intracellular BCG bacilli in macrophages would co-localize with ferroportin, although in heparin-treated macrophages only 43 ± 0.5% of BCG bacilli overlap with ferroportin staining (Figs 5C and S6).