pt. 1. Classes and prediction of cell-penetrating peptides / ¿lo Langel -- pt. 2. Mechanisms of cell-penetrating peptides / Astrid Grs̃lund -- pt. 3. Functionality of shuttling proteins and protein-derived peptides / Alain Prochiantz -- pt. 4. Applications of cell-penetrating peptides in gene modulation and protein transport / Steven F. Dowdy -- pt. 5. Selective targeting to tumors and other tissues with cell-penetrating peptides : in vivo applications / Ernst Wagner -- pt. 6. CPP methods.