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In some embodiments, the lipid-based drug delivery formulation or composition comprises a penetration enhancer (e.g., a low molecular weight alcohol (e.g., ethanol, oleyl alcohol), alkyl methanol sulphoxides, N-methyl-2-pyrrolidone, fatty amines (e.g., oleylamine), fatty acids (e.g., oleic acid, palmitoleic acid, linoleic acid, myristate acid), gluconic acid (the hexonic acid derived from glucose by oxidation of the aldehyde group at C-1 to a carboxyl group) and its derivatives, such as gluconolactone (especially, glucono-D-lactone, a chelating agent produced by the oxidation of glucose), azone and propylene glycol, singly or in combination)

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doi: 10.1242/dev.01725