SYCP3 and infection: Both live M. tb and M. bovis BCG infected macrophages exhibit a ~2.4-fold and 2-fold increase in Cor1 mRNA expression after 3 h of infection compared to uninfected macrophages, while there was no notable change in Cor1 expression upon infection with heat-killed mycobacteria or with M. smeg (Figures 3A, , B).