IGLJ3 and triple-A syndrome: To seek for key circRNAs in the progression of AAA, five circRNAs (circHLA-DRB6, circCFLAR, circEPSTII, circRBM33, circHLA-IGLJ3) with higher expressed abundance, more fold change and higher significance were selected for RT-qPCR examination in six sequencing samples (Fig. 3A).