CPPs can be classified into various types based on their origin and structure:
1. Cationic CPPs: These peptides are rich in positive charges and include sequences such as TAT peptide derived from the HIV-1 virus. 2. Amphipathic CPPs: These peptides have both hydrophobic and hydrophilic regions, like the MAP peptide. 3. Hydrophobic CPPs: These peptides predominantly consist of hydrophobic amino acids and can include sequences like Pep-1.
