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. 2021 Apr 14;12:633821. doi: 10.3389/fphar.2021.633821

FIGURE 1.

FIGURE 1

Schematic model of the cascade of events characterizing the IFN response in SADs. Blue: antigen drive; gradient blue: facilitator mechanisms for antigen uptake; yellow: receptors; green: intracellular signaling; red: IFN and ISG. The arrows indicate feed-forward regulatory mechanisms. Orange ovals: main cells implicated in IFN-I production. Abbreviations: IC: immune complexes; IFNAR: interferon-alpha/beta receptor; ISG: interferon-stimulated gene; ISRE: IRF: interferon regulatory factor; JAK: Janus kinase; LDG: low-density granulocyte; LL-37: cathelicidin-37; pDC: plasmacytoid dendritic cell; PMN: polymorphonuclear neutrophil; PRR: pattern recognition receptor; SADs: systemic autoimmune diseases; STAT: signal transducer and activator of transcription.