To determine the complementary DNA strand produced from a given DNA strand, you pair the nucleotides according to base pairing rules: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). For example, if the DNA strand is 5'-ATCG-3', the complementary strand would be 3'-TAGC-5'. Thus, the complementary DNA sequence is synthesized in the opposite direction.
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