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Zinc transporter <scene name='69/694236/Yiip/1'>Yiip</scene> is an integral membrane protein found in the membrane of Esherichia coli and a member of the  [https://en.wikipedia.org/wiki/Cation_diffusion_facilitator cation diffusion facilitator family]. Members of this family occur all throughout the biological realm, their primary function being the export of divalent transition metal ions from the cytoplasm to the extracellular space ^{[https://www.bnl.gov/isd/documents/71335.pdf]}. They work to regulate the amount of divalent metals inside of the cell, which are necessary for different biological functions but can prove to be fatal to the cell in excess amounts. Zinc is essential for the growth and development of cells and zinc levels can affect everything from gene expression to immune response. While YiiP is an integral membrane protein in the cells of Escherichia coli, understanding the mechanism of regulation behind it can help researcher's better understand the cation diffusion facilitator equivalents in eukaryotic cells.