HDAC9 and infection: Before exploring whether exposure to low concentrations HDAC inhibitors during monocyte differentiation altered the cytokine/chemokine response of pro-inflammatory Mφ1 and anti-inflammatory Mφ2 upon Mtb infection, we first investigated the cytokine/chemokine responses of standardly differentiated Mφ1 and Mφ2 following infection with Mtb. Expression levels of 41 analytes were assessed in the supernatants of Mtb-infected Mφ1 and Mφ2 and compared to uninfected controls 24 h after infection.