Crystallography of hemerythrin

X-ray crystallographic studies of hemerythrin from Golfingia gouldii show that the molecules pack in a tetragonal cell with two sets of molecules in an apparently face-centred array seen in projection along the 4-fold axis, but displaced relatively to each other by approximately c10 in the axial direction. Both sets of molecules lie on 4-fold rotation axes, so that the subunits of each octameric molecule are related in pairs by a molecular...