1086
This sequenced region of the V beta locus contains an average number of repetitive DNA elements ( 21 Alu , three L1 , three MER , and three retrovirus - related elements .
 GENE: Alu; GENE: L1
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: Alu; GENE: L1