Recombinant Anti-Ad fiber knob x Anti-CEA Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-Ad fiber knob and anti-CEA parental antibodies. It contains a His-tag for affinity purification. And the two Fd regions are connected by a flexible linker. Learn more: Ad fiber knob CEA Tandem Fab