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. 2021 Jul 17;176:113867. doi: 10.1016/j.addr.2021.113867

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© 2021 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 6 — Strategy of using self-healing microcapsules to modulate immunization microenvironments for vaccination[274]. The corresponding characterizations of gigaporous microspheres and antigen-loaded microcapsules are displayed below: (A and A′) Scanning electron microscopy (SEM) images in a magnified view. Scale bars, 10 μm. (B and B′) SEM images in a local feature. Scale bars, 1 μm. (C and C′) Confocal images in two-dimensional (2D) cut view. Scale bars, 5 μm. (D and D′) 3D reconstruction. Scale bars, 10 μm.