Advance online publication from Nucleic Acids Research:

Rebecca P. Wu, Derek S. Youngblood, Jed N. Hassinger, Candace E. Lovejoy,
Michelle H. Nelson, Patrick L. Iversen and Hong M. Moulton

Cell-penetrating peptides as transporters for
morpholino oligomers: effects of amino acid
composition on intracellular delivery and cytotoxicity

Nucleic Acids Research, 2007, 1–10
doi:10.1093/nar/gkm478

http://nar.oxfordjournals.org/cgi/reprint/gkm478v1