Cover picture: The "extended M2" helix bundle model of the pore domain of the 7 nicotinic acetylcholine receptor, viewed perpendicular to the pore axis (left) and down the pore axis (right). Diagram drawn using GRASP. Red, Asp or Glu; blue, Lys; yellow, Ser or Thr. See the article by Adcock et al. on p. 1211.