What does the term "recruitment of T-cell" mean? With respect to the article, what does the term "recruitment of T-cell" mean? Who recruits T- cell? Does recruiting T-cell mean the T-cells get a sense of directionality to get activated by the APC's?

If I'm interpreting it properly, it's the adaptive response that's recruiting the T cell, evidenced by the last line in their abstract:

"Therefore, the contribution of a T cell clone to the immune response is mostly determined by the time of its entry into the immune repertoire, i.e., the time of first cell division after antigen encounter."

It's strange because when i think of recruiting a T cell it's always to the tissue or site of infection or what have you.