Dynabeads Protein G beads are uniform, 2.8-μm superparamagnetic beads with recombinant Protein G (∼17 kDa) covalently coupled to the surface. Dynabeads Protein G beads provide a great alternative to Sepharose resin or agarose resin for immunoprecipitation (IP) combined with your own antibody, and both manual and automated protocols are available.