1251
Selectivity cytotoxicity was observed following exposure to 6 - nitro - 7 - hydroxycoumarin ( 6 - NO ( 2 ) - 7 - OHC ) and 7 , 8 - dihydroxycoumarin ( 7 , 8 - OHC ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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