Figure 2.

Example of packing defect analysis for a pure POPC bilayer. In all panels, the light gray grid represents the matrix M at 1 Å resolution. The aliphatic atoms are colored in yellow, and the other atoms are colored in gray (including polar head and glycerol group). (A) A three-dimensional view is shown. (B) A top view is shown of a patch of upper leaflet. (C) The same view as in (B) with the coordinates of the various elementary packing defects is shown. Deep, shallow, and all packing defects are colored in blue, green, and red, respectively.