Ferric oxyhydroxide core of ferritin.
D003460:Crystallization; D005293:Ferritins / Q000096:biosynthesis*; D007501:Iron / Q000378:metabolism*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010087:Oxides; D014961:X-Ray Diffraction
D010087:Oxides; D005293:Ferritins; D007501:Iron