1654
In addition, several novel KRAB-containing zinc finger genes and a novel conserved sequence element were identified.
 KRAB-containing zinc finger genes, conserved sequence element
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 KRAB-containing zinc finger genes, conserved sequence element