C Quantitative kinetics analysis by SPR. All analytes were run at increasing concentrations of 0.625, 1.25, 2.5, 5, and 10 nM, at 37°C and pH 7.4. The positive controls-rhAng1, BowAng1, COMP-Ang1-all bound strongly to immobilized hTie2-Fc. There was no detectable binding of VT, or the negative control, rhVEGF, to immobilized hTie2-Fc. 