M2e, human TFA（Cat No.:I045790）, is the extracellular domain of the M2 protein from influenza A virus, highly conserved across strains and subtypes. As a synthetic peptide, it is widely studied as a universal influenza vaccine candidate due to its ability to elicit cross-protective immune responses. The M2e sequence, though poorly immunogenic alone, can be conjugated to carriers or formulated with adjuvants to enhance immunogenicity. Supplied as a trifluoroacetate (TFA) salt for stability and solubility, human M2e is an essential research tool for studying influenza immunology, vaccine design, and antiviral strategies.