Horse-spleen ferritin is known to crystallize in three different space groups, cubic F432, orthorhombic P2(1)2(1)2 and tetragonal P42(1)2, but only the cubic form has been fully investigated. Crystals of the tetragonal form of apoferritin have been obtained, by the vapour-diffusion technique, which diffract beyond 3.0 A. The unit-cell dimensions are a = b = 146.63, c = 152.94 A. The orientation of the non-crystallographic symmetry axes of the apoferritin molecule (24 subunits of 174 amino acids each, arranged in a 432 point symmetry rhombododecahedron) has been determined by a self-rotation Patterson function. The asymmetric unit is made of six subunits and was positioned by molecular replacement.
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