TGM2 and triple-A syndrome: Although the cause of death after laparotomy in Tgm2–/–/F13a1–/– mice seemed to be unrelated to aneurysm development, it seemed possible that Tgm2–/–/F13a1–/– mice that would otherwise have developed a large AAA were more likely to die prematurely than those developing a small aneurysm.