LIFE SCIENCE

Detailed explanation-1: -However, a small portion of long-lived T cells still remains for rapid response upon pathogen re-exposure. This kind of cells is called memory T cells. Because memory T cells have been trained to recognize specific antigens, they will trigger a faster and stronger immune response after encountering the same antigen.

Detailed explanation-2: -The traditional linear differentiation model of T-cell development posits that, upon antigen challenge, naïve CD4 T cells become activated and proliferate into effector cells, which then survive the contraction phase and persist as quiescent memory cells.

Detailed explanation-3: -Abstract. The control of the differentiation pathways followed by responding CD8(+) T cells to produce protective memory cells has been intensely studied. Recent developments have identified heterogeneity at the effector cytotoxic T-lymphocyte level within which a bona fide memory cell precursor has emerged.