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Figure 7 The PESDA microbubbles fixed with formalin and examined under scanning electron microscopy (SEM) using a 0.22-µm Millipore filter, at (A) low magnification (bar = 10 µm; magnification 1,420x) and (B) high magnification (bar = 10 µm; magnification 7,400x). Under SEM the microbubbles were characterized as less electron-dense structures of different sizes, spherically shaped and not exhibiting any other surface features of hematopoietic cells.