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. 2021 Mar 29;11:7012. doi: 10.1038/s41598-021-86257-4

Figure 5.

Figure 5

Scanning electron microscopy images of (a) untreated bone and demineralized bone using (b) ethylene-diamine tetraacetic acid (EDTA), (c) hydrochloric acid (HCl), (d) HCl/EDTA mixture, and (e,f) formic acid (CH2O2). Visible collagen fibrils are outlined in yellow, dotted lines and d-spacing are indicated by arrows.