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Figure 3: Luminescence spectra of [Os(bpy)2CO(4-phpy)](PF6)2 in ethanol solution (2.8 mg/100 mL) in the presence of varing concentrations of heparin. From bottom to top, heparin concentration: 0, 9.9, 19.6, 29.1, and 38.5 μg/mL.