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SEM images of morphology and structure of (a) delivery system cross-section; (b) microfibrillated cellulose (MFC) 3D matrix; (c) nanofibrillated cellulose (NFC) 3D matrix; (d) MFC-NFC-carboxymethylcellulose (CMC) 3D matrix at 500× and (e) 2000×.
