3800
Assuming that 9-cis-retinoic acid ( 9-cis-RA ) inhibits TCR-mediated apoptosis , nur77 may cause apoptosis by monomer in the absence of 9-cis-RA and may inhibit apoptosis by heterodimer with RXR in the presence of 9-cis-RA .
 protein: RXR; protein: nur77
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: RXR, nur77 
Answer:
 protein: RXR; protein: nur77