6593
We thus propose that during an in vivo chronic response, a narrow range of avidity of the TCR -CD8 complex conditions long-term clonotype persistence, and that the level of CD8 contribution is adjusted to keep clonotypes with variable TCR affinities within this avidity window .
 protein: CD8; protein: TCR; protein: TCR; protein: TCR -CD8 complex
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: CD8, TCR, TCR, TCR -CD8 complex 
Answer:
 protein: CD8; protein: TCR; protein: TCR; protein: TCR -CD8 complex