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Groups II and IV were incubated with 20 micro M lycopene for 1 h before further incubating ; groups III and IV with 15 nM of TCDD for further 1 h .
 Chemical: lycopene; Chemical: TCDD
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: lycopene; Chemical: TCDD