MFN2 and triple-A syndrome: Western blotting showed that compared with H-ASCs, the level of mitochondrial fission protein p-Drp-1 ser616 was significantly reduced in AAA-ASCs, whereas the level of mitochondrial fusion protein Mitofusin 2 (Mfn2) was greatly increased (Figure 4(b)), suggesting increased mitochondrial fusion in AAA-ASCs.