Immunogen sequence: MGHTRRQGTS PSKCPYLNFF QLLVLAGLSH FCSGVIHVTK EVKEVATLSC GHNVSVEELA QTRIYWQKEK KMVLTMMSGD MNIWPEYKNR TIFDITNNLS; Positive Samples: A-549, U-87MG; Cellular Location: Membrane, Single-pass type I membrane protein. CD80 (B7-1) and CD86 (B7