AffiniPure-VHH™ secondaries are polyclonal single-domain antibodies (nanobodies†) derived from hyper-immunized alpacas. 10x smaller than conventional whole IgG antibodies, <15KDa VHH fragments are perfect for imaging experiments where good penetration is necessary. AffiniPure-VHH™ secondary antibodies are cross-adsorbed for exquisite specificity against target species with minimal cross‑reactivity to other stated species, making them suitable for application in multiple labeling experiments. †Nanobody® is a trademark of ABLYNX N.V.-Based on immunoelectrophoresis and/or ELISA, the antibody reacts with whole molecule rabbit IgG. It also reacts with the light chains of other rabbit immunoglobulins. The antibody has been tested by ELISA and/or solid-phase adsorbed to ensure minimal cross-reaction with bovine, human and mouse serum proteins, but it may cross-react with immunoglobulins from other species.