T GATA2 is present at larger levels within the endothelial cells comprising LVV leaflets (E, arrows) compared with endothelial cells lining the jugular veins and jugular lymph sacs (E, arrowheads). GATA2 can also be present in cardiac valves (F ) and arterial endothelial cells (J ). Boxed region within a is shown at a higher magnification in B . Scale bars: 50 m. JLS, jugular lymph sac; JV, jugula