RGST‑45B is a biotin‑conjugated rabbit polyclonal antibody specific for the GST (Glutathione S‑Transferase) tag, widely used in recombinant protein expression and purification. The biotin label enables highly sensitive streptavidin‑based detection, making this reagent ideal for ELISA, Western blotting, and amplified immunoassay systems. Affinity purification ensures strong specificity and minimal background, supporting clear and reproducible results across diverse assay formats. Produced by Immunology Consultants and supplied in a 1 mg format, RGST‑45B provides a versatile, high‑performance reagent for researchers requiring sensitive detection of GST‑tagged proteins.