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Dictated by specific hydrogen bonding patterns , " Watson–Crick " base pairs ( guanine–cytosine and adenine–thymine ) allow the DNA helix to maintain a regular helical structure that is subtly dependent on its nucleotide sequence .
 person: Watson–Crick
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Watson–Crick