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ILs (a) enhances drug (b and c) permeation into excised porcine skin (open bar: tetraalkylphosphonium oleate; hatched bar: tetraalkylphosphonium hexanoate; cross‐hatched bar: choline geranate; closed bar: tetraalkylphosphonium geranate). Adapted from “Ionic Liquids as a Class of Materials for Transdermal Delivery and Pathogen Neutralization,” by M. Zakrewsky et al., 2014, Proceedings of National Academy of Sciences of the United States of America, 111, pp. 13313–13318
