Lyophilized macromolecules complexed with zinc and encapsulated within degradable microspheres are slowly released for at least one month (pages 795–799).
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Langer, R. Controlled release of a therapeutic protein. Nat Med 2, 742–743 (1996). https://doi.org/10.1038/nm0796-742
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DOI: https://doi.org/10.1038/nm0796-742
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