13688
Retinoid X receptor and c-cerbA/thyroid hormone receptor regulate erythroid cell growth and differentiation .
 protein: c-cerbA/thyroid hormone receptor; protein: Retinoid X receptor
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: c-cerbA/thyroid hormone receptor, Retinoid X receptor 
Answer:
 protein: c-cerbA/thyroid hormone receptor; protein: Retinoid X receptor