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. 2020 Nov 18;6(47):eaaz7524. doi: 10.1126/sciadv.aaz7524

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — Time sequential images directly show HA nucleation, agglomeration, and coalescence process. Nucleus 1 labeled by yellow arrow represents one HA nucleus attaching to a larger HA cluster. Nucleus 2 labeled by green arrow represents one HA nucleus attaching to cluster and jumping from one position to another position after its nucleation. Cluster 3 labeled by blue arrow represents one cluster attaching to another cluster. Arrows 4 and 5 show that new nuclei first attach to a small cluster and then the cluster merges to a larger cluster. Scale bar, 100 nm.