Comparison of the protein yields obtained by immunopurification using different antibody formats. The protein SNAP-Twist2 was immunopurified from total lysate using sepharose columns to which the following antibodies were covalently linked: llama IgG anti-SNAP polyclonal antibodies; 6xHis tagged llama recombinant antibody 3G1B in VHH format; the same 3G1B antibody fused to the rabbit Fc domain.