Organization of the scFv targeting domain and Fc
effector domain of an immunoconjugate molecule. VH and
VL, heavy chain and light chain variable regions,
respectively, derived from a scFv fusion-phage clone (7); a
(G4S)3 polypeptide (curved line) links the
VH to the VL region. H, hinge region of a human
IgG1 Ig containing two disulfide bridges. CH2 and CH3, second and third
constant regions of a human IgG1 Ig.