8525
In order to decipher the pathway that leads to Hox gene induction , we have investigated whether a Hox gene regulator , the leucine zipper transcription factor MafB / Kr , is itself transcriptionally regulated by the environmental signals .
 Hox gene, Hox gene, MafB, Kr
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Hox gene, Hox gene, MafB, Kr