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. 2022 Dec 28;632:122559. doi: 10.1016/j.ijpharm.2022.122559

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Fig. 3 — Chemical structures of safe adjuvants for intradermal vaccination A. CpG 1018. DNA backbone has phosphorothioate modification to improve adjuvant stability. B. Synthetic GLA with six 14-carbon side chains. C. Imiquimod. D. Poly(I:C). E. cGAMP. F. PCPP polymer.