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. 2021 Nov 4;22(21):11943. doi: 10.3390/ijms222111943

Figure 2.

Figure 2

Optical profilometry of native (A,D,G), meso-structured (B,E,H), and macro-structured (C,F,I) substrates. While the native substrate has a roughness in terms of nanometers, the meso- and especially the macro-structured substrates demonstrate roughness in terms of micrometers.