The RFP (Red fluorecent protein) is a molecular marker isolated from anemone and is often used to study protein localization, reporter gene expression and protein-protein interaction. The agarose bead surface is coated with anti-RFP antibody, a highly specific mouse monoclonal antibody that can be used for immunoprecipitation, co-immunoprecipitation, affinity chromatography of natural RFP, RFP mutants and their fusion proteins. Characteristics of Anti-RFP Affinity Beads 4FF: 1) The ligand antibody has a very high affinity with RFP, which can efficiently capture RFP tagged proteins in the cell lysis; 2) After immunoprecipitation, SDS-PAGE test has a cleaner background and is more conducive to the identification of protein interactions. 3) Agarose material is characterized by low non-specific adsorption and good compatibility, with a capacity of more than 1 mg RFP fusion protein/ml (up to 5 mg/ml), and can be used for the massive purification of RFP fusion proteins.