(a) RT-PCR analysis of Notch ligands and receptors in non-transformed ovarian epithelial (HIO180), ovarian cancer (HeyA8, SKOV3ip1, OVCAR3, A2774, A2780, IGROV), endothelial (HUVEC, MOEC), and pericyte-like (10T1/2) cells. (b) Western blot analysis of Dll4 expression in the tissues obtained from SKOV3ip1 and A2780 ovarian cancer models. (c, d) RT-PCR and real time RT-PCR analysis of Dll4 expression in MOECs after exposure to VEGF or basic fibroblast growth factor (bFGF) for 48 hours under hypoxic (1% O2) conditions.