7049
We have previously isolated a cDNA for a transcription factor referred to as Zfhep ( zinc finger homeodomain enhancer - binding protein ) containing two separate zinc finger domains , ZD1 and ZD2 , each of which binds DNA , and a homeodomain .
 Zfhep, zinc finger homeodomain enhancer - binding protein, ZD1, ZD2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Zfhep, zinc finger homeodomain enhancer - binding protein, ZD1, ZD2