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Cover Illustration: Bacterioferritins are oligomeric iron-storage proteins, which form spherical particles consisting of 24 identical monomers and exhibiting 432 point-group symmetry. They contain one haem b moiety at the interface between two monomers and a di-nuclear metal binding center. The X-ray structure of bacterioferritin from Mycobacterium smegmatis was determined to a resolution of 2.7 Å. In the figure, the quaternary structure of bacterioferritin from M. smegmatis is displayed. Two of the subunits forming a dimer are colored in green and blue, respectively, while the remaining 22 subunits are colored in gray. In between the dimer, the haem moiety is shown in red with the iron ion in pink. The two zinc ions present in the di-nuclear site of each subunit are displayed in dark red. (For details, see Janowski et al. pp. 1138–1150.)