T cells involved in immunological memory of specific antigens. It is not entirely clear whether Tm derive from effector T cells that become quiescent until re-exposed to antigen (historically, the standard view) or whether the generation of effector T cells in the primary immune response is accompanied by the production of central memory cells with a capacity for self-renewal and that act as memory stem cells. There appear to be two distinct classes of Tm cells.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=200942 Article in the Journal of Clinical Investigation (2001).
Subjects: Medicine and Health.