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Influence of the Mg2+ concentration the nanofibril length. Origami concentration is 20 nm. a) X̄n for the four connector densities after 1 h of assembly time. The X̄n increases with increasing [Mg2+]. b) Reducing the [Mg2+] results in disassembly of 18‐HG origami fibrils. After resupply of [Mg2+] the initial X̄n can be restored. c) TEM images show fibril lengths for 18‐HG origami cuboids at different [Mg2+]. Scale bars 250 nm.
