PrEST Antigen FAM221B, 100µL (APrEST75450) | Atlas Antibodies™

Atlas Antibodies PrEST Antigen FAM221B (APrEST75450) is a recombinant Protein Epitope Signature Tag (PrEST) antigen, the same defined protein fragment used to raise the corresponding Human Protein Atlas antibody. PrEST antigens are engineered to cover a unique, low-homology region of the target protein, minimizing cross-reactivity with related family members. This precise design makes them a reliable reference reagent for antibody validation work.

It is commonly used as a blocking peptide and positive control antigen to confirm antibody specificity in immunodetection assays, and as a reference standard in assay development. Running this antigen alongside the corresponding antibody helps confirm that observed signal is genuinely target-specific. This product should be stored and handled according to the manufacturer's recommended conditions to preserve activity and specificity.

• Gene Description: family with sequence similarity 221, member B
• Corresponding Antibody: HPA026577
• Buffer: PBS and 1M Urea, pH 7.4.
• UniProt ID: A6H8Z2

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