Location of selected heme pocket residues in Ngb and Mb. The relative location of neuroglobin residues studied in this work (Phe28 and Phe 42) is shown. The left panel presents a top view and the right panel a side view, relative to the heme plane. Heme moieties and side chains are shown as sticks: Ngb Phe 28, blue; Ngb Phe 42, green, Ngb His64, red, Ngb His 96 and heme, yellow; Mb Leu 29, light blue; Mb Phe43, light green; Mb His64, light red, Mb His93 and Ngb heme, pale yellow. The proximal histidines are omitted in the top view for clarity. Protein data Bank entries 1OJ6 (Ngb) and 2W6W (Mb) were used. Figure was generated with PyMOL 0.99rc6 [26].