13690
Here we investigated the impact of retinoid X receptor ( RXR ), retinoic acid receptor ( RAR ), and of the c-erbA/thyroid hormone (T3) receptor ( c-erbA/TR ) on growth and differentiation of erythroid cells using an in vitro culture system of stem cell factor-dependent erythroid progenitors .
 ( protein: retinoid X receptor, None) , ( protein: c-erbA/thyroid hormone (T3) receptor, None) , ( protein: c-erbA/TR, None) , ( cell type: stem cell factor-dependent erythroid progenitors, None) , ( protein: retinoic acid receptor, None) , ( cell type: erythroid cells, None) , ( protein: RAR, None) , ( protein: RXR, 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: retinoid X receptor, None) , ( protein: c-erbA/thyroid hormone (T3) receptor, None) , ( protein: c-erbA/TR, None) , ( cell type: stem cell factor-dependent erythroid progenitors, None) , ( protein: retinoic acid receptor, None) , ( cell type: erythroid cells, None) , ( protein: RAR, None) , ( protein: RXR, None) 