AngiopoietinsAngiopoietin-2Angiopoietin-1Receptor, TIE-2Receptor, TIE-1Receptors, TIEVascular Endothelial Growth Factor ANeovascularization, PhysiologicAngiogenesis Inducing AgentsVascular Endothelial Growth FactorsNeovascularization, PathologicEndothelial Growth FactorsSerumReceptor Protein-Tyrosine KinasesLymphokinesMembrane GlycoproteinsIntercellular Signaling Peptides and ProteinsBlood VesselsEndothelium, VascularEndothelial CellsProteinsRNA, MessengerVascular Endothelial Growth Factor Receptor-1Reverse Transcriptase Polymerase Chain ReactionSerum AlbuminImmunohistochemistryCells, CulturedSignal TransductionProto-Oncogene ProteinsBlotting, Western