Word Count : 274

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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 _________ __________ ______ _______ _______ _____ _______ __________ _________ __________ ____ _______.
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