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Scanning electron microscopy (SEM) images of the ciprofloxacin and azithromycin sinus stent (CASS). The scale bar is located at lower right. * : ciprofloxacin (inner) layer, **: azithromycin (outer) layer.
A. Cross sectional view of the single layer of ciprofloxacin
B. Cross sectional view of the dual layers of ciprofloxacin and azithromycin
