Terminology for quantitative response of T cells to antigen complexes In the article, there is a statement which is: > Although DCs are remarkably efficient in evoking T cell responses with few antigen– MHC complexes (1–100 per DC) (1–3), they must first encounter a T cell with appropriate antigen specificity (one in 105 to 106). What does the part "Although DCs are remarkably efficient in evoking T cell responses with few antigen– MHC complexes (1–100 per DC) (1–3)" mean? What is the significance of the value "1–100 per DC"? What does evoking T cell responses with few antigen–MHC complexes mean?

It means that a dendritic cell only needs between 1 and 100 antigen–MHC complexes on its surface in order to activate a T cell.