Bioconjugate Chem. 2009, 20, 702–709

An Improved Cell-Penetrating, Caspase-Activatable, Near-Infrared
Fluorescent Peptide for Apoptosis Imaging

Dustin Maxwell,† Qing Chang,‡ Xu Zhang,‡ Edward M. Barnett,‡ and David Piwnica-Worms