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Amino acid sequences of the I-box region of RXRα, USP, COUP, RARα, TRβ, PPAR, and VDR. The I-box lies within Helix 9 (H9) and helix 10 (H10) (shaded) and has been shown to be essential to dimerization. The amino acid residues equivalent to hRXRα E390 and K417 are also marked.
