FG2 CD2 HC5 F6 CD1 G1 G5 B14 H16 Figure 7-4 Model of myoglobin at high resolution Only the a carbon G15 85 atoms are shown. The EF3 LEF1 eme gI oup is shown A16 in red, and two key E20 G19 histidine residues in TH,N H5 AB1 green. [After R.E. Dickerson. In The Proteins, vol. 2. 2nd d. H. Neurath, ed GH4 (Academic Press 1964),p.634.]