Figures & data
Figure 1 Skin microanatomy.
![Figure 1 Skin microanatomy.](/cms/asset/5e8acf05-74a1-4063-adf5-87d0e88d7948/dddt_a_44401_f0001_c.jpg)
Figure 2 (A–E) Commonly seen dissolving microneedles and the drug-release procedure.
![Figure 2 (A–E) Commonly seen dissolving microneedles and the drug-release procedure.](/cms/asset/705c77f2-9b9d-4ec6-93d6-ea9bafcc5572/dddt_a_44401_f0002_c.jpg)
Figure 3 Microneedle separation into the skin was mediated by hydrogel swelling.
![Figure 3 Microneedle separation into the skin was mediated by hydrogel swelling.](/cms/asset/32da1e09-9274-4966-84df-45889dfece01/dddt_a_44401_f0003_c.jpg)
Figure 4 Separable arrowhead microneedles.
![Figure 4 Separable arrowhead microneedles.](/cms/asset/05d03163-fa04-4584-95bf-02db3560d5fe/dddt_a_44401_f0004_c.jpg)
Figure 5 Sustained vaccine release from “multilayer tattoo” microneedles.
Abbreviations: uv-PNMP, poly(o-nitrobenzyl-methacrylate-co-methyl-methacrylate-co-poly(ethylene-glycol)-methacrylate) on brief exposure to ultraviolet; PBAE, biodegradable poly(β-amino-ester); PS, protamine-sulphate; pGag, gag polyprotein; poly(I:C), polyriboinosinic polyribocytidylic acid; SPS, poly(4-styrene-sulphonate).
![Figure 5 Sustained vaccine release from “multilayer tattoo” microneedles.](/cms/asset/e0aeb60d-e27b-4d41-a90a-b5ba344078c4/dddt_a_44401_f0005_c.jpg)