Human deoxyhemoglobinPDB ID: 2HHB
Hemoglobin is the protein that transports oxygen in the blood. It is an allosteric protein that changes shape when it binds to oxygen. This structure shows the form with no oxygen bound.
The crystal structure of human deoxyhaemoglobin at 1.74 A resolution
Fermi, G., Perutz, M.F., Shaanan, B., Fourme, R.
Journal: (1984) J.Mol.Biol. 175: 159-174