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. 2021 Nov 5;9:766399. doi: 10.3389/fbioe.2021.766399

FIGURE 5.

FIGURE 5

Safranin-O staining (red, stained negatively charged proteoglycans and the TCNF) with Fast Green counterstain (green, stained proteins) and cells stained with hematoxylin of (A,B) 7030, (C,D) 8020, and (E,F) COL I bioinks. Scale bar is 100 μm.