What is the identity of the protein labeled with the question mark in the eukaryotic preinitiation complex shown below? 
Definitions:
Conversion Price
The predetermined price at which convertible securities, like bonds or preferred shares, can be converted into a specified number of common shares.
Convertible Security
A financial investment that can be transformed into a different form, typically bonds or preferred stocks that can be converted into common stock.
Convertible Debenture
A type of bond that the holder can convert into a specified number of shares of common stock in the issuing company.
Conversion Value
The monetary value of a convertible security if it is converted into a different asset, usually shares of the issuing company's stock.
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