6899
Furthermore, HIV-1 replication is cooperatively stimulated when the distinct LT-betaR and TNF receptor systems are simultaneously engaged by their specific ligands.
 protein: LT-betaR; protein: TNF receptor systems
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: LT-betaR, TNF receptor systems 
Answer:
 protein: LT-betaR; protein: TNF receptor systems