A tube formation assay was performed to assess the anti-angiogenic effect of bac I and II, either alone or in combination, on 2H-11 and HUVEC, as previously described [13 (link),58 (link)]. Briefly, 96-well angiogenesis μ-plates (Ibidi, Martinsried, Germany) were prepared by coating wells with Matrigel (Corning), according to the manufacturer’s instructions. In the respective complete medium, 2H-11 and HUVEC were resuspended, supplemented with either vehicle or bac I and/or II, and were plated at 1.5 × 104 cells per well. After 2-h incubation, the number of loops formed was counted.
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