Fig. 3.

2D 13C–13C correlation spectra of labeled penetratin in DMPC/DMPG membranes (8:7) at P/L = 1:15. (a) (I5, Q8, K13)-labeled penetratin at 249 K with 50 ms PDSD mixing (black) and at 310 K with 100 ms PDSD mixing (red). (b) K13-labeled penetratin at 273 K with 50 ms DARR mixing (black) and at 310 K with 30 ms DARR mixing (red). (c) 2D PDSD spectrum of K13-labeled penetratin at 310 K with 100 ms mixing. Note the lipid/peptide cross peaks.