BioMag® secondary antibody magnetic particles are used extensively in the capture of immune complexes for immunoprecipitation and separation of primary antibody-labeled cells. Secondary antibody coatings also afford a convenient method for binding specific primary antibodies to BioMag® particles. BioMag®Plus Mouse anti-Fluorescein IgG particles may be used to isolate fluorescein-tagged species such as labeled cells or nucleic acids.: