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TD-1 (Transdermal peptide) is a short peptide that can promote the delivery of macromolecule drugs, especially protein drugs, through the skin barrier. TD-1 can significantly improve the transdermal delivery efficiency of protein drugs such as insulin and human growth hormone, allowing them to reach systemic circulation. Research on TD-1 transdermal drug delivery system[1].

[1] Chen Y, et al. Transdermal protein delivery by a coadministered peptide identified via phage display[J]. Nature biotechnology, 2006, 24(4): 455-460. DOI:10.1038/nbt1193