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. 2020 Oct 9;17(1):71–77. doi: 10.1007/s11302-020-09729-8

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© The Author(s) 2020

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Fig. 2 — Geoffrey Burnstock, Peter Illes, and Yong Tang at the 1st Sino-German Symposium on Purinergic Signalling, Pain and Acupuncture in Chengdu, 2012. Reproduced with permission from [57]