1067
Upon differentiation with retinoic acid ( RA ) , transcription of the Rex - 1 gene decreases rapidly .
 GENE: Rex - 1 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: Rex - 1 gene 
Answer:
 GENE: Rex - 1 gene