Mutations in EPHB4 cause human venous valve aplasia. - Lyons O; Walker J; Seet C; Ikram M; Kuchta A; Arnold A; Hernández-Vásquez M; Frye M; Vizcay-Barrena G; Fleck RA; Patel AS; Padayachee S; et al. (JCI insight, 2021)