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In 1937 , William Astbury produced the first X-ray diffraction patterns that showed that DNA had a regular structure .
 person: William Astbury
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: William Astbury 
Answer:
 person: William Astbury