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; protein: c-erbA/thyroid hormone (T3) receptor; protein: c-erbA/TR; cell type: stem cell factor-dependent erythroid progenitors; protein: retinoic acid receptor; cell type: erythroid cells; protein: RAR; protein: RXR
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: retinoid X receptor, c-erbA/thyroid hormone (T3) receptor, c-erbA/TR, stem cell factor-dependent erythroid progenitors, retinoic acid receptor, erythroid cells, RAR, RXR 
Answer:
 protein: retinoid X receptor; protein: c-erbA/thyroid hormone (T3) receptor; protein: c-erbA/TR; cell type: stem cell factor-dependent erythroid progenitors; protein: retinoic acid receptor; cell type: erythroid cells; protein: RAR; protein: RXR