8291
Our studies thus indicate that, despite the rapidity of NK cell-mediated lysis , AP-1 transcription factor is activated during the early stage of NK cell cytolytic programs and that engagement of NK cell inhibitory receptors for MHC class I molecules impairs the very early activation of AP-1 .
 protein: AP-1 transcription factor; protein: NK cell inhibitory receptors; protein: AP-1; protein: MHC class I molecules
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: AP-1 transcription factor, NK cell inhibitory receptors, AP-1, MHC class I molecules 
Answer:
 protein: AP-1 transcription factor; protein: NK cell inhibitory receptors; protein: AP-1; protein: MHC class I molecules