14692
Site-directed mutagenesis demonstrated that this HS-40 enhancer- zeta 2 globin promoter interaction is mediated by the two GATA-1 factor binding motifs located at -230 and -104, respectively.
 HS-40, zeta 2 globin promoter, GATA-1 factor binding motifs
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:
 HS-40, zeta 2 globin promoter, GATA-1 factor binding motifs