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Interstrand distances between the phosphorus atoms flanking a TATA sequence within DNA. (a) B-DNA viewed perpendicularly to the helical axis. (b) B-DNA viewed along the 5′–5′ vector. (c) A-DNA viewed along the 5′–5′ vector. (d) The complexed TATA box (1) viewed along the 5′–5′ vector.
