The Matrigel tube formation was performed and analyzed as previously described, with minor modifications [21 (link)-23 (link)]. Namely, cells were added onto μ-slides Angiogenesis (Ibidi) and incubated at 37°C in 5% CO2 in medium containing 0.5% FBS. Endothelial cell tube formation was assessed with an inverted photomicroscope (Olympus IX71) and experiments were conducted in triplicates and repeated at least three times.