6392
The exogenous fos gene was rapidly induced to maximal levels within 1 - 2 hr of estrogen addition .
 GENE: fos gene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: fos gene 
Answer:
 GENE: fos gene