2600
Subcloning of DNA fragments from the 8 . 5 - kilobase ( kb ) insert of pAVO4 defined a 4 - kb DNA fragment which contained the functional FBP + gene and its regulatory region .
 functional FBP + gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 functional FBP + gene