Isoelectric focusing of anti-Rh(D) IgGs. After electrophoresis, the gel was stained with CBB and photographed. The migration of pI standard proteins is shown in lanes 1 and 14 and of polyclonal human IgG in lanes 2, 8, and 13. The position of the 9 anti-Rh(D) MoAbs is shown at the bottom of the gel.