IFNG and COVID-19–associated multisystem inflammatory syndrome in children: Diorio et al. compared the proteomic profiles with a PEA of MIS-C patients that also fulfilled the Ravelli MAS criteria and those that did not and found that the following MAS-associated proteins were significantly elevated in MIS-C patients who also met the MAS criteria: CD163 (macrophage activation), CXCL9 (IFN-γ signaling), IFN-γ, IL-2RA (T-cell activation) and v-set and immunoglobulin-domain containing protein (VSIG4) [27,38].