4568
Cetn1 possesses the sequence features of an expressed retroposon : the gene lacks introns , the open reading frame is not interrupted by stop codons , and the coding region is flanked by a pair of direct repeats .
 GENE: Cetn1
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: Cetn1