title: LUMENating blood vessels.
abstract: The acquisition of a lumen is an essential step in vascular morphogenesis. In this issue of Developmental Cell, Xu et al. (2011) show that the small GTPase Rasip is a critical regulator of cytoskeleton dynamics and cell adhesion, which together drive the emergence of vascular lumens.
authors.affiliation: Department of Molecular, Cell, and Developmental Biology, UCLA, Los Angeles, CA 90095, USA. arispe@mcdb.ucla.edu
authors.forename: M Luisa
authors.initials: ML
authors.lastname: Iruela-Arispe