Fig. 1: Crystal structure of the nitrosyl-myoglobin (MbNO) (PDB entry: 10.2210/pdb1hjt/pdb).
From: Femtosecond X-ray emission study of the spin cross-over dynamics in haem proteins
The haem is represented as sticks (Fe [orange], C [grey], N [blue], O [red]). The zoom (left) shows the distal NO ligand and proximal histidine 93 (His93), which links the Fe atom of the haem porphyrin to the F helix.
