March 2008 issue
Cover illustration: The multiple-conformer model of Tyr33 with the maximum-entropy method (MEM) charge density. The MEM charge density is shown as a grey mesh. The difference MEM charge density is shown as a red mesh. The charge-density levels are 0.70 e Å-3 for the MEM map and 0.40 e Å-3 for the difference map (p. 237).