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Streptococcus mutans strains Ingbritt , and its derivative B7 which had been passaged through monkeys , have been used to investigate how the synthesis of extracellular glucosyl - and fructosyltransferases is regulated .
 Anatomy: strains; Anatomy: extracellular
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: strains; Anatomy: extracellular