Peptide antigen, namely, a peptide used to trigger animal's immune system to develop antibodies specific to that peptide. Nowadays, the use of synthetic peptide antigens as immunogens has markedly increased, and this technique is also widely applied for immune research such as tumor immunotherapy etc. With ten years experience in antigen peptides supply, Creative Peptides is experienced in the synthesis of complex antigen peptides, such as glycopeptides or hyperphosphorylation peptides.