Immunogen sequence: AQDLHAERSAA QLSLSSRLQL TLYQYKTCPF CSKVRAFLDF HALPYQVVEV NPVRRAEIKF SSYRKVPILV AQEGESSQ Highest antigen sequence identity to the following orthologs - mouse 89%, rat 91%. The PTGES2 gene encodes for the enzyme prostaglandin E synthase