9683
Three different site - directed mutations of the cyclic AMP response element each reduced the nerve growth factor effect by > 90 % .
 GENE: nerve growth factor
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: nerve growth factor 
Answer:
 GENE: nerve growth factor