C5 and deep vein thrombosis: We used ELISA to measure serum C5b‐9 levels in Piga/Muc4‐DKO group mice, and the results revealed that the serum C5b‐9 level in the mice with DVT was greater than that in the sham‐operated mice (Figure 4C), which may be related to further activation of complement by acute TE.