Generation of pericentrin antibodies and Borg5 rabbit and chicken antibodies were described previously (Liu and Zheng, 2009 (link); Vong et al., 2010 (link)). All the other antibodies and molecules used in this study were commercially available, including α-tubulin (T9026, 1:1000; Sigma-Aldrich), actin (A3853, 1:200; Sigma-Aldrich), GM130 (610822, 1:200; BD Biosciences, Franklin Lakes, NJ), isolectin β4 (I21412, 1:200; Invitrogen), Nkx2.5 (sc-8697, 1:50; Santa Cruz Biotechnology, Santa Cruz, CA), PECAM-1 (550274, 1:10; BD Biosciences), phalloidin (A22287 or A12379, 1:200; Invitrogen), phospho-MLC (3674, 1:200; Cell Signaling Technology, Danvers, MA), Sept7 (18991, 1:1000; IBL, Minneapolis, MN), and VE-cadherin (sc-6458, 1:50; Santa Cruz Biotechnology).