Whole-mount immunofluorescence of P7 mesenteries, showing efficient FOXP2 depletion in Foxp2flox/-;Tie2-Cre vessels. Dotted line indicates vessel width. Quantification of mesenteric collecting lymphatic vessel width in P7 Foxp2flox/-;Tie2-Cre and littermate controls (n = vessels [mice], as indicated). 