2sod is a 4 chain structure with sequence from Bovin. This structure supersedes the now removed PDB entry 1sod. The October 2007 RCSB PDB Molecule of the Month feature on Superoxide Dismutase by David S. Goodsell is 10.2210/rcsb_pdb/mom_2007_10. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.