Immunogen sequence: IPGGGITKTL YDESCSKEIQ MAVLLKFVSE GDNIPDALGL VEYLNEWLQI LKPLSDDPTV SASRWKIPSS WRLLFGSGLP Highest antigen sequence identity to the following orthologs: Mouse - 88%, Rat - 85%. Chaperone protein which promotes assembly of the 20S proteas