1157
MATERIALS AND METHODS: In the present work, we have studied, the activities of GATA-1 and SP1 during differentiation of cultured erythroid progenitors derived from cord blood and from fetal livers , as well as from beta zero- thalassemia patients .
 ( cell type: erythroid progenitors, None) , ( protein: SP1, None) , ( protein: GATA-1, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: erythroid progenitors, None) , ( protein: SP1, None) , ( protein: GATA-1, None) 