Immunogen sequence: SMRSLFSDHG KYVESFRRFL NHSTEHQCMQ EFMDKKLPGI IGRIGDTKSE IKILSIGGGA GEIDLQILSK VQAQYPGVCI NNEVVEPSAE QIAKYK Highest antigen sequence identity to the following orthologs: Mouse - 88%, Rat - 90%. In mammals, histamine is metabolized by tw