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. 2022 May 20;14(5):1097. doi: 10.3390/pharmaceutics14051097

Figure 3.

Figure 3

Scanning electron microscope (SEM) images of (a) out-of-plane MNs Source [115] (Adapted from Ref. [115]). (b) combined in-plane and out-of-plane MNs [116]. (Adapted with permission from Ref. [116]. Copyright 2008 Elsevier).