http://www.cd-bioparticles.com/p/Protein-A-Magnetic-Particles_20_194_233_259.htmlAbsolute Mag™ Protein A Magnetic Particles, 200 nm (# WHM-X030) are high-capacity and high-throughput affinity particles for antibody purification and immunoprecipitation methods. The protein A is covalently attached to the magnetic bead surface which can bind to antibodies from many different species, enabling purification of antibodies from crude extracts.Antibody/Protein Purification, Immunoprecipitation