SEARCH Articles Figures Tables Biological complexity Biological systems coordination Biological systems transition metals Biological systems, complex Complex systems Complex systems complexes Complexes biological Coordinate system Coordinated transition metal complexes Coordination in complexes Coordination metal complexes Coordination transition metal complexes In biological systems Metal biological systems Metal complex system Metal complexes biological systems Metals biology Metals in biology Metals, in biological systems Systems complexity Transit system Transition coordinate Transition metal complexes biology Transition metal systems Transition-metal coordination Transitional coordinates Transitions in metal complexes