2035
The priming activity of DNA incised by either of the Drosophila enzymes can be enhanced , however , by an additional incubation with E . coli endonuclease IV , which is known to cleave depurinated DNA on the 5 ' - side of an apurinic site .
 E . coli endonuclease IV
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 E . coli endonuclease IV