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. 2020 Jul 8;21(14):4820. doi: 10.3390/ijms21144820

Figure 5.

Figure 5

Figure 5

The development of hydroxyapatite (HAP). (A) Amorphous calcium phosphate (ACP) coiling (yellow arrows) was a remarkable precrystalline stage that formed polycrystalline masses (PC, in yellow circle). (B) Primary crystallization events occurred at the center of the coiling polycrystalline mass (yellow arrows) and resulted in 5–10 nm focus with the crystallographic texture of HAP (hollow arrows; scale bar = 5 nm). (C) Primary crystallization triggered a chain reaction that expanded HAP to crystallite grains (white arrows and numbers discrete HAP crystallites; scale bar = 2 nm).