Click MDL in the left panel for additional options. For example, to turn off rotation (recommended!) click MDL and remove the check mark next to rotation. Use the shift key and the mouse left button for Zoom.

Cartoons view of one subunit.

Deoxyhemoglobin subunit with heme.

Add the proximal histidine.

Heme and the proximal histidine only.

Heme with the polypeptide chain backbone.

Oxyhemoglobin subunit with heme.

Heme in oxyhemoglobin with the proximal histidine.

Hemoglobin with bpg.