11518
Nerve growth factor ( NGF ) and retinoic acid ( RA ) exert important actions on PC12 cells .
 GENE: Nerve growth factor; GENE: NGF
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, NGF 
Answer:
 GENE: Nerve growth factor; GENE: NGF