IFNGR1 and Mendelian susceptibility to mycobacterial diseases: Figure 2 shows a visual representation of IFN-γR1 expression and IFN-γ signalling in CD14+ monocytes for a representative control as well as for PID01 [with the known IFNGR1 (c.818del4) mutation] and two other suspected MSMD patients with potential IFN-γR-related deficiencies.