December 2010 issue
Cover illustration: Structure of a crystal form of human methaemoglobin (p. 1316). The contents of the hexagonal unit cell and the filament that it defines are shown in ribbon and surface representations, along with an outline of the unit cell for reference. Details consisting of three haemoglobin molecules and the two kinds of interfaces that relate them are also shown. The filaments display 6122 symmetry with a periodicity of 677.5 Å.