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A: Size distribution of MB before and after centrifugation and flotation. B-D: Fluorescence microscopy images of HITC-loaded MB (B), individual and co-loading of rhodamine B and coumarin 6 into MB (C), and differently-sized MB batches loaded with coumarin 6 (D). E: STED microscopy image of a coumarin 6-loaded MB. F-G: Scanning electron microscopy (SEM) images of an intact (F) and a destroyed (G) PBCA MB.
