Primary antibodies were: DLL1 (rabbit, Santa Cruz, sC-9102), Alpha 1 Sodium Potassium ATPase (mouse, Abcam, ab7671), GM130 (mouse, BD Biosciences, 610823), KDEL (mouse, Abcam, ab1223), EEA1 (rabbit, Abcam, ab2900), Rab5 (mouse, Sigma, R7904), Rab6A (mouse, Sigma, WH0005870M1), Transferrin receptor (mouse, Zymed, 13-6800), Caveolin (rabbit, BD Biosciences, 610060), Rab11 (rabbit, Sigma, R5903), Pan-Cadherin (mouse, Sigma, C1821), β-Actin (mouse, MPBiomedicals, 69100). Monoclonal antibodies against DLL1 were described [34] (link). Secondary antibodies were: Donkey anti-rat-Alexa488, goat anti-rat-Alexa488, goat anti-mouse-Alexa555, goat anti-rabbit-Alexa488, goat anti-mouse-Alexa633, goat anti-rabbit-Alexa555 (Molecular probes, Invitrogen).
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