MFAP4 and Salmonella Infections: To investigate the role of macrophages in the control of Salmonella infection, macrophage reporter embryos, Tg(mfap4:mCherry-F) were injected in the HBV with Sal-GFP or PBS and the global macrophage population was imaged by fluorescence microscopy from 3 hpi to 4 dpi (Figure 3A).