Figure 1. ²H spectra of mechanically oriented 7∶3 POPC-d ₃₁:POPG bilayers in the presence (upper panel) and absence (lower panel) of 1 mol% SP-B (1–25,63–78).

The spectra were acquired with 60000 transients at 23°C. Dashed vertical lines indicate the quadrupole splitting of deuterons on the C15 acyl chain segment of POPC-d ₃₁ in the absence of SP-B (1–25,63–78).