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extended winged-helix domain of tau138 and related proteins Tau138 is one of three subunits of the tauB subcomplex of yeast transcription factor IIIC. This extended winged-helix domain of tau138 appears to interact with the TPR (tetratricopeptide repeat) array of tauA subunit tau131, and may therefore play a role in linking tauA, tauB, and TFIIIB to regulate the formation of the RNA polymerase III pre-initiation complex.
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