FLT4 and persistent truncus arteriosus: Furthermore, gravimetry analysis showed that the total cardiac water content (%) was substantially higher in VEGFR‐3f/− mice than in VEGFR‐3f/f mice after TAC surgery but was similar between the two groups after sham surgery (Figure 2D), suggesting that mice with VEGFR‐3 knockdown can maintain cardiac water balance at baseline.