The ChromoTek GFP-Trap® Magnetic Agarose Kit consists of an anti-Green Fluorescent Protein (GFP) Nanobody (VHH), which is covalently bound to magnetic agarose beads. GFP-Trap Magnetic Agarose Kit is used to immunoprecipitate GFP-fusion proteins from cell extracts of various organisms like mammals, plants, bacteria, yeast, insects etc.