5KP9:
reference: Designed proteins induce the formation of nanocage-containing extracellular vesicles., Votteler J, Ogohara C, Yi S, Hsia Y, Nattermann U, Belnap DM, King NP, Sundquist WI, Nature. 2016 Dec 8;540(7632):292-295. doi: 10.1038/nature20607. Epub 2016 Nov 30. PMID: 27919066

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