The deoxy form of Hb is on top, oxy on the bottom.
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Color coding:
- Beta chains: orange and red
- Alpha chains: cyan and blue
- Heme iron: Yellow
- Bound oxygen: light green
- Proximal histidine: purple
- Distal histidine: pink
- Beta FG hinge histidine: dark green
- Alpha contacts: Thr38 yellow, Thr41 green, Pro44 gray
| Deoxy |
 |
| Oxy |
 |