Immunogen sequence: PLSQALPQLP GSSSEPLEPE PGRARMGVES YLPCPLLPSY HCPGVPSEAS AGSGTPRATA TSTTASPLRD GFGGQDGGE. Prolyl hydroxylase domain proteins HIF PHD1, HIF PHD2 and HIF PHD3 (known as PHD1, PHD2 and PHD3 in rodents, respectively) can hydroxylate HIF-alp