3706
In F9 , which is a prototype of embryonal carcinoma cells expressing hst , the expression of hst gene is positively regulated by a downstream octamer motif that functions as an enhancer .
 GENE: hst; GENE: hst gene
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: hst; GENE: hst gene