14929
One cDNA clone of a primary response gene, expressed upon macrophage differentiation, encoded for Egr-1 , a zinc finger transcription factor .
 Egr-1, cDNA clone, zinc finger transcription factor
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:
 Egr-1, cDNA clone, zinc finger transcription factor