STAT1 and STING-associated vasculopathy with onset in infancy: Furthermore, analysis of PBMCs from a SAVI patient carrying the STING N154S mutation (Supplementary Figure 3A) by Western blotting revealed that PBMCs from SAVI patients exhibited elevated TBK1 and STAT1 phosphorylation in the absence of stimulation compared to that in healthy control PBMCs.