Resource at http://www.pdb.org/
http://www.pdb.org/pdb/search/structidSearch.do?structureId=2ZCY

Resource at http://www.pdb.org/
http://www.pdb.org/pdb/search/structidSearch.do?structureId=3BDM

Resource at http://www.rcsb.org/
http://www.rcsb.org/pdb