Phospho-VEGFR-2 (Tyr-801) peptide (coupled to carrier protein) corresponding to amino acids surrounding Tyr-801 in human VEGFR-2. This sequence has high homology to the conserved site in rat and mouse VEGFR-2, and has significant homology to the conserved sites in VEGFR-1 (Tyr-794) and VEGFR-3 (Tyr-812).