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=== Zn<sup>2+</sup> Binding Sites ===
=== Zn<sup>2+</sup> Binding Sites ===
[[Image:full_view.png|thumb|left|]]
[[Image:activesites.png|thumb|left|]]
Each zinc promoter contains three zinc binding sites. There is an active site (Site A), and two cytoplasmic binding sites (Site B and C). It was found that only site A and C are conserved, while the function of Site B not well defined, though it seems to play a role in subunit dimerization.
Each zinc promoter contains three zinc binding sites. There is an active site (Site A), and two cytoplasmic binding sites (Site B and C). It was found that only site A and C are conserved, while the function of Site B not well defined, though it seems to play a role in subunit dimerization.