1153
Hemoglobin switching in humans is accompanied by changes in the ratio of the transcription factors , GATA-1 and SP1 .
 GATA-1, Hemoglobin, transcription factors, SP1
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:
 GATA-1, Hemoglobin, transcription factors, SP1