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Figure 7
The highly symmetric centre of the homotetramer. The side chains of the four Ser117 residues form a barrier between the two hormone binding sites. The 2Fo − Fc neutron map (at 1.2 r.m.s.) shows clearly the different orientation of the γ-deuterium atoms of serine residues in chains A and B, and the presence of only one water molecule.

IUCrJ
Volume 1| Part 6| October 2014| Pages 429-438
ISSN: 2052-2525
doi:10.1107/S2052252514021113