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Erwin Chargaff's rules are fundamental principles in molecular biology that describe the specific composition of DNA in different organisms. Chargaff, through careful biochemical analysis of DNA from various species, observed that the amount of adenine (A) always equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C). This relationship is now expressed as _______ _______ ________ ______ __________ _________ _________ __________ ____ ___ _____ ______.
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