2635
We show here that proerythroblasts and mature erythroid cells contain a diffusible activity ( TAG ) capable of transcriptional activation of GATA-1 and that this activity decreases during the terminal differentiation of erythroid cells .
 ( protein: GATA-1, None) , ( cell type: proerythroblasts, None) , ( cell type: mature erythroid cells, None) , ( cell type: erythroid cells, 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:
 ( protein: GATA-1, None) , ( cell type: proerythroblasts, None) , ( cell type: mature erythroid cells, None) , ( cell type: erythroid cells, None) 