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. 2021 Apr 30;23(10):861–873. doi: 10.1016/j.jcyt.2021.04.004

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© 2021 International Society for Cell & Gene Therapy. Published by Elsevier Inc. All rights reserved.

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 2 — (A) Various tissue sources of MSCs in current COVID-19 clinical trials. MSCs from umbilical cord, adipose tissue and bone marrow appear to be the predominant MSC tissue sources. (B) Number of MSC doses employed in current COVID-19 clinical trials. One and three doses of MSC infusions are most commonly employed in ongoing trials. Five doses is the highest number of doses observed. Figure data taken from https://clinicaltrials.gov/. (Color version of figure is available online).