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Scanning electron microscopy of 3% PTX-NS. Scanning electron micrographs of PTX-NS without cryoprotector (1A), freeze-dried without cryoprotector (1B), with the addition of HP-Cyd as a cryoprotector (1C) and freeze-dried with HP-Cyd (1D). Magnifications: 1 μm (A and D), 0.5 μm (B), 5μm (C).
