Watson and Crick discovered there were only four in DNA strands, no matter what the species.

Name: Watson and Crick discovered there were only four in DNA strands, no matter what the species.
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Watson and Crick discovered that there were four types of nitrogenous bases in DNA strands, namely adenine (A), guanine (G), cytosine (C), and thymine (T). These four bases pair up in a specific way (A with T and C with G) to form the rungs of the DNA ladder.

Watson and Crick Discovered There Were Only Four in DNA