Figure 4: The Image of Tri-Functional Antibody. The model of tri-functional antibody containing B7.1 and IgG1 light chain constant domain (blue), B7.1 and IgG1 heavy chain constant domains (red), light chain variable domain of antiHER2 antibody, and IgG1 light chain constant domain (pink), and heavy chain variable domain of antiHER2 antibody and IgG1 heavy chain constant domains (green).