Annexin A1 is a calcium-dependent phospholipid binding protein derived from spinal animals. It is an effector molecule that mediates the anti-inflammatory effects of intracellular glucocorticoids. It can be widely expressed in tissues and participates in all stages of the cell growth cycle. Annexin A1 can exist in a soluble form, and can also be stably or reversibly bound to cytoskeletal proteins to regulate the interaction between cells and extracellular mechanisms. Annexin A1 (1-11) is a peptide fragment composed of 11 amino acids. In the process of peptide synthesis, although the Annexin A1 (1-11) sequence is not long, it is not difficult to produce. The hydrophobicity and side reactions of the sequence are both Increase the difficulty of production.