Fig. 4. Cellular accumulation of metalloprobes and confirmation of their intracellular localization via correlation with Mito-Tracker: fluorescence imaging in live H9c2(2-1) cells following 30 min treatment with gallium(iii) complexes (5a, lower panel; and 8a, top panel; 20 μM) and Mito-Tracker (25 nM). Note that, while 8a penetrates H9c2(2-1) cells, localizes within the mitochondria, and its localization correlates with the Mito-tracker, 5a does not show significant uptake under identical conditions. Similar results were obtained in MCF-7neo cells (data not shown).