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Henk Granzier’s research group uses an atomic force microscope sensitive enough to hold onto a single titin protein molecule and measure the tiny forces that occur during stretching and contracting under various conditions. (Photo: Katie Maass/Sarver Heart Center) Henk Granzier’s research group uses an atomic force microscope sensitive enough to hold onto a single titin protein molecule and measure the tiny forces that occur during stretching and contracting under various conditions.