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...ices with a high GC content have stronger-interacting strands, while short helices with high AT content have weaker-interacting strands.<ref>{{cite journal |a ..., Arnott S, Chandrasekaran R, Ratliff RL |title=Polymorphism of DNA double helices |journal=J. Mol. Biol. |volume=143 |issue=1 |pages=49–72 |year=1980 |pmid=7 ...

...the active site. The protein is shown as a [[ribbon diagram]], with alpha helices in red, beta sheets in yellow and loops in blue. Generated from [http://www ...