Figure 2. Half ²H NMR spectra of mechanically oriented 7∶3 POPC-d ₃₁:POPG bilayers in the absence of peptide (a), in comparison to (b) with 1 mol% SP-B (8–25,63–78) or (c) SP-B (1–25,63–78).

The spectra were all acquired at 23°C. Vertical lines indicate the quadrupole splitting of POPC-d ₃₁ deuterons in the absence of peptide.