2120
Importantly , a single base change in the fifth position of the c - fos sequence ( GGTCTnnnAGACC to GGTCA / GnnnAGACC ) produced an element that bound the estrogen receptor and conferred estrogen - dependent transcriptional activation of a reporter gene .
 GENE: c - fos sequence; GENE: estrogen receptor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: c - fos sequence; GENE: estrogen receptor