Immunogen sequence: LVTGDNGDFT LRLEDVSQAQ AGTYTCHIHL QEQQLNATVT LAIITVTPKS FGSPGSLGKL LCEVTPVSGQ ERFVWSSLDT PSQRSFSGPW LEAQEAQLLS QPWQCQLYQG ERLLGAAVYF TELSSPGAQ. LAG-3 is a 70-kDa surface glycoprotein in the immunoglobulin superfamily, with structural h