Patches made up of microneedles may be an effective way to deliver, or 'tattoo', DNA vaccines, researchers led by the Massachusetts Institute of Technology's Darrell Irvine report in Nature Materials. In their paper, they present "an approach for rapid implantation of vaccine-loaded polymer films carrying DNA, immune-stimulatory RNA, and biodegradable polycations into the immune-cell-rich epidermis, using microneedles coated with releasable polyelectrolyte multilayers."

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