Immunogen sequence: PPISYIWYKQ QTNNQEPIKV ATLSTLLFKP AVIADSGSYF CTAKGQVGSE QHSDIVKFVV KDSSKLLKTK TEAPTTMTYP LKATSTVKQS WDWTTDMDGY L Highest antigen sequence identity to the following orthologs: Mouse - 26%, Rat - 25%. T cell activation by APCs is positiv