(center map)
(1) RRM1+RRM2*+Fe_super_2+_endsuper_ -> Fe_super_2+_endsuper_:RRM1:RRM2*
(2) Fe_super_2+_endsuper_ - FTH1 - FTL -> intracellular sequestering of iron ion
(3) H_sub_2_endsub_O_sub_2_endsub_ - Fe_super_2+_endsuper_ -> hydroxyl
(4) ferroheme b+O_sub_2_endsub_ - HMOX1 -> biliverdin+CO+Fe_super_2+_endsuper_