Lymphatic valves in P7 mesenteric vessels of control and Foxp2flox/-;Tie2-Cre mice. A spectrum of defects in the mutants ranging from shortened integrin-α9+FN-EIIIA+ valve leaflets (middle panels) to a complete loss of leaflets (right panels) are shown. Quantification of the proportion of valves with integrin-α9+ leaflets (G), and leaflet length (H) in P7 Foxp2flox/-;Tie2-Cre and littermate controls (n = valves [mice], as indicated). Leaflet length = 0 corresponds to valves with no leaflets. 