6239
Expansion of certain trinucleotide repeats causes several types of human diseases , and such tracts are associated with the formation of deletions and other types of genetic rearrangements in Escherichia coli , yeast , and mammalian cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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