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Figure 2
The insulin hexamer defined by X-ray analysis by Adams et al. (1969BB1). The hexamer has 32 symmetry and is viewed along the threefold axis, on which two zincs are found. 2-Zinc-insulin hexamers are found in insulin-storage granules in beta cells of the islets of Langerhans and are used in crystalline forms of insulin used to treat diabetes.

IUCrJ
Volume 4| Part 4| July 2017| Pages 308-321
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517009241