Immunogen sequence: DEELETRAHR VATEERGRKP HQIPASTPQN PATSQHPPPP PGHRSQAPSH RPPPPGHRVQ HQPQKRPPAP SGTQVHQQKG PPLPRPRVQP KPPHGAAENS LSP. CD2 (LFA-2) is a monomeric surface antigen (MW range 45-58 kDa) of the human T-lymphocyte lineage that is expressed on