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Sigma 70 subunit (1sig) of RNA polymerase from Escherichia coli

• What structural elements are present in the protein?
• What is the subunit composition?

Malhotra, A., E. Severinova, and S. A. Darst. 1996. Crystal structure of a sigma 70 subunit fragment from E. coli RNA polymerase. Cell 87:127-136.

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