Global Use and Research of Cell Penetrating Peptides Cell penetrating peptides (CPPs), also known as protein transduction domains (PTDs), are short sequences of amino acids that are able to penetrate cell membranes and facilitate the intracellular delivery of various cargos such as peptides, proteins, nucleic acids and nanoparticles. Some of the first CPPs identified include the HIV-1 Tat protein transduction domain and penetratin which is...
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