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Figure 1.
Figure 1. View along the 2-fold axis. One potein molecule
is shown in white with its symmetry-related molecule in yellow.
On top, His87 forms a hydrogen bond accross the 2-fold axis to
the very same histidine of the symmetry-related molecule. The
ammonium ion (middle) and the sulphate ion (bottom) are involved
in a hydrogen bonding network between the two symmetry-related
molecules.
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