FFAR2 and tuberculosis: Finally, we have identified the expression of FFAR3 within the HIP, which suggests that TB/BA effects could be mediated by this receptor, which is one of the 2 G-protein coupled receptors (FFAR2 and FFAR3, formerly GPR43 and GPR41) (Le Poul et al., 2003; Tang et al., 2015) able to bind SCFA in the brain.