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. Author manuscript; available in PMC: 2019 Jan 16.
Published in final edited form as: Nature. 2018 May 2;557(7703):86–91. doi: 10.1038/s41586-018-0057-7

Fig. 3 |.

Fig. 3 |

Atomic-level structural characterization of ferritin crystal-hydrogel hybrids by XRD. a-c, XRD patterns (at temperature T = 293 K) of a ferritin crystal infused with polymer precursors (a), after polymerization and expansion (b) and after contraction with CaCl2 (c). Light micrographs of the crystal are shown in the insets; the separation between the major ticks of the ruler is 100 μm. d, 1.06-Å-resolution structure (T = 100 K; PDB ID, 6B8F) of the contracted ferritin crystal-hydrogel hybrid, showing the electron density surrounding the Ca-mediated ferritin-ferritin interfaces and highlighting the two observed Ca coordination conformations. The electron density (2Fo-Fc) map (grey) is contoured at 1.5σ. Water molecules and Ca ions are shown as red and blue spheres, respectively.