The VEGFR phospho-regulation antibody sampler kit can be used to detect the level of phosphorylation of VEGFR-2 (Tyr-801) relative to the total expression level of VEGFR-2. In addition, the anti-VEGFR-2 (Tyr-801) can be used to detect phosphorylation of the conserved sites in VEGFR-1 (Tyr-794) and VEGFR-3 (Tyr-812). The kit also includes a VEGFR-3 antibody, as well as peptides for antibody blocking experiments.