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The DNA double helix plays a central role in the formation and function of DNA–protein complexes, which are essential for the organization, regulation, and expression of genetic information in cells. The double helical structure of DNA, composed of two antiparallel strands held together by complementary base pairing, provides both stability and specificity for protein interactions. The regular geometry of the helix, with its major and minor grooves, allows ______ _______ ____ _______ ___ _________ ___ _______ _________ ____ ________.
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