Data processing, refinement and evaluation statistics.

<p>Footnotes.</p><p>1. Values in parentheses are for the highest resolution bin (2.21–2.1 Å).</p><p>2. Number of reflections used to calculate R_work (94.9%).</p><p>3. Number of reflections from a randomly selected subset used to calculate R_free (5.1%).</p><p>4. Values in parentheses are for the highest resolution bin for refinement (2.154–2.1 Å).</p><p>#Two lipid molecules were modelled with 50% occupancy due to symmetry issues.</p><p>* Figures obtained using MolProbity <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0092727#pone.0092727-Davis1" target="_blank">[33]</a>.