2186
Sequence and deletion analysis of the recombination enhancement gene ( ref ) of bacteriophage P1 : evidence for promoter - operator and attenuator - antiterminator control .
 GENE: recombination enhancement gene; GENE: ref
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: recombination enhancement gene; GENE: ref