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Optoacoustic imaging of three injection sites located in the heart (25; 35,5 and 40 mm) and a reference injection site (31 mm). MSCs were labeled with 5 μg DiR/ml. Top row: Multispectral optoacoustic images of the DiR signal (green) overlayed on the 800 nm image (grey scale). Bar graph: Maximum MSOT signal (a.u.) detected at the injection sites (red); volume in which the DiR signal was superior to background signal (black).
