TH and neoplasm: The TH peptidescan deliver payloads specifically to tumor cells, making them attractivevehicles for the delivery of therapeutic payloads.23 We employed two TH peptides, here termed TH1 and TH2, LTVPLWand VLTVQPW, respectively, that possess terminal Trp residues.24 In contrast to the physiological pentapeptidesubstrate SrpE, the TH1 and TH2 peptides are hexa- and heptapeptides,respectively.