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Cone diagrams for schematic representation of the 2H spin Hamiltonian parameters given in Table 2 and obtained for (a) the ternary complex of TyrH/NO/3,5-2H-tyr; (b) the quaternary complexes of TyrH/NO/3,5-2H-tyr/6-MPH4 (red) and TyrH/NO/tyr/6,7-2H-6-MPH4 (green). Figure (c) shows a stick diagram of the catalytic site of PheH crystalized with thienylalanine and BH4 (taken from PDB file: 1MMK). The vectors show possible orientations for the Fe-NO bond axis.
