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