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After the first crude X-ray diffraction images of DNA were collected in the 1930 s , William Astbury had talked about stacks of nucleotides spaced at 3.4 angström ( 0.34 nanometre ) intervals in DNA .
 William Astbury
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William Astbury