18542
Three groups of new - borns were reared in different conditions : one control group ( no FLX ) and two groups exposed to environmental concentrations of FLX ( 1 and 100ng / L ) from 15 days pre - hatching to 1 month post - hatching .
 Chemical: FLX; Chemical: FLX
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: FLX; Chemical: FLX