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. 2022 Apr 5;14(7):1477. doi: 10.3390/polym14071477

Figure 21.

Figure 21

In vitro mineralization study by optical microscopy of pure PCL (a) and its composites with 15 wt% neat CNC (b) and 15 wt% CNC modified with PGlu (c). Staining was performed with alizarin red S. Red color indicates the presence of calcium deposits (reproduced from [224] under the terms of the Creative Commons CC BY license).