Furthermore, the co-expression of Dcn/Apoc1 and Dcn/Fabp4 was validated by multicolor immunofluorescence staining in both normal and AAA mouse tissues, confirming the existence of Fib_Apoc1+/Fabp4+ in AAA (Figure 4I, Supplementary Figure S4E). Here, APOC1 is linked to triple-A syndrome.