21973
Leydig cells were treated with two concentrations of OP ( 10 ( - 4 ) M , 10 ( - 8 ) M ) alone or concomitantly with anti - estrogen ICI 182 , 780 ( 1 mu M ) .
 Chemical: estrogen; Chemical: ICI 182 , 780
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: estrogen; Chemical: ICI 182 , 780