Antibodies used were as follows: Anti-Septin2 (Cat# 07–1813; Millipore for Western blot; and Cat# HPA018481; Sigma-Aldrich for IF); additional anti-Septin2 antibody used for immunofluorescence was a generous gift from Dr. Elias Spiliotis (Drexel University, Philadelphia, PA; Spiliotis et al., 2008 (link); Fig. 1 A), anti-Septin9 (Cat# sc-293291; Santa Cruz), anti-Septin6 (Cat# sc-514806; Santa Cruz for Western blot), anti-SEPT7 (Cat# ab175229; Abcam for Western blot), anti-Cortactin (Cat# 05–180; Millipore), anti-MMP14 (MT1-MMP; Cat# MAB3328; Millipore), anti-Tks5 (fish, G-7; Cat# sc-376211; Santa Cruz), anti-FAK (Cat# 610087; BD PharMingen), anti-GAPDH (Cat# AM4300; Ambion), anti-mCherry (Cat# 5993–100; BioVision), FITC-conjugated AffiniPure Donkey anti-Rabbit IgG (H+L; Cat# 711–095-152; Jackson Immunoresearch), Rhodamine Red-X AffiniPure Donkey Anti-Rabbit IgG (H+L; Cat# 711–295-152; Jackson Immunoresearch), Alexa Fluor 647 AffiniPure Donkey Anti-Rabbit IgG (H+L; Cat# 711–605-152; Jackson Immunoresearch), Goat Anti-Mouse IgG1 Secondary Antibody (Atto 488; Cat# LS-C209452; LSBio), Purified Rat Anti-Mouse TER-119 rat anti-mouse erythrocyte (Cat# 550565; BD PharMingen), and IHCPlus PECAM-1/CD31 Antibody Monoclonal (Cat# LS-B3446; LSBio).