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X-ray diffraction patterns for (a) CNC-A and (b) CNC-C exposed to artificial macrophage PSF for up to 9 months. In some cases, sharp Bragg lines due to the residual salts of PSF still adhered to the samples are observed. The sharp lines in the patterns are the Bragg lines of residual salts from PSF that remained adhered to the samples despite repeated washings with deionized water.
