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*[[Guanine]]
*[[Cytosine]]
: The [[nucleotide]]s are arranged in complementary pairs. [[Adenine]] and [[Thymine]] pair up on opposite sides of the [[DNA]] strand. The same is true for [[Cytosine]] and [[Guanine]]. When the strand is pulled into two pieces this allows the [[DNA]] to make two exact copies of itself. So if one side of the strand has the code AAAACCCTTG then the other will have the code TTTTGGGAAC.