5988
In the current study, we show 9-cis retinoic acid ( RA ), a ligand for the nuclear hormone receptor retinoid X receptor ( RXR ) and retinoic acid receptor ( RAR ), markedly induces the expression of MCP-1 .
 protein: MCP-1; protein: RAR; protein: RXR; protein: retinoic acid receptor; protein: nuclear hormone receptor 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: MCP-1, RAR, RXR, retinoic acid receptor, nuclear hormone receptor retinoid X receptor 
Answer:
 protein: MCP-1; protein: RAR; protein: RXR; protein: retinoic acid receptor; protein: nuclear hormone receptor retinoid X receptor