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Manuel Francisco Morales ( July 23 , 1919 – November 12 , 2009 ) was a Honduran-born American biophysicist who did pivotal research on the molecular basis of muscle contraction .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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