Immunogen: Synthesized 23-amino acid peptide, SLLTEVETP TRNGWECRCND SSD, the ectodomain of matrix protein 2 (M2e) of the influenza A virus avian flu / bird flu strain (A/chicken/Korea/GH2/2007/H9N2) (GenBank accession# ADV36584). Specificity: Reacts with the matrix protein 2 of influenza A that contains the same ectodomain sequence.