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Configured to bind primary antibodies, secondary antibodies are frequently used to assist in the detection, sorting and purification of target antigens. A secondary antibody is specific, both at the species and isotype level, to the relevant primary antibody and usually bears a fluorescent/radioactive/ chemiluminescent or a chromogenic - tag for signal detection and quantification. abm offers a wide array of labelled/conjugated (i.e. Horseradish Peroxidase, biotin, Alkaline Phosphatase and Fluorescein) secondary antibodies with high signal sensitivity and low background. abm also offers the most comprehensive selection of secondary antibodies with respect to the species of origin (human, mice, rats, rabbits, sheep, chickens, horses, guinea pigs and more). Both monoclonal and polyclonal secondary antibodies are available for use in various biochemical assays including ELISA, Western Blotting, immunostaining, immunohistochemistry and immunocytochemistry.