Immunogen sequence: LTFQDLHLHH GGHQAANTSH DLAQRHGLES ASDHHGNFSI TMRNLTLLDS GLYCCLVVEI RHHHSEHRVH GAMELQVQTG KDAPSNCVVY PSSS Highest antigen sequence identity to the following orthologs: Mouse - 60%, Rat - 59%. VISTA (V-domain Ig containing suppressor of