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Figure 3 A fluorescently labeled QW7437 microbubble moving along an arteriole and capillary. An arteriole with a diameter of 19 µm, branching into an 18-µm arteriole and a 10-µm arteriole turning into a 7-µm capillary, was imaged under transillumination in A. The flow in the arteriole is from right to left. In B, a PKH-26–labeled QW7437 microbubble was moving through the arteriole at 60 s after the bolus injection. C shows the image of the bubble entering into the capillary at 0.07 s after B. In D, the bubble was moving along the capillary without stoppage at 0.13 s after B.
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