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. 2019 Oct 31;275:102060. doi: 10.1016/j.cis.2019.102060

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© 2019 Published by Elsevier B.V.

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. 11 — (A) Schematic of the miR-21 detection using hyaluronic acid conjugated graphene oxide (HA-GO), adapted from ref. [62]. (B) The mechanism of oxytetracycline (OTC) fluorescent detection based on target-responsive graphene oxide hydrogel, adapted from ref. [63].