RE: Share Price Retreat..15 May 2020 15:52
Or we could use this snappy catch phrase....
Memory T cells undergo different changes and play different roles in different life stages for humans. At birth and early childhood, T cells in the peripheral blood are mainly naive T cells.[10] Through frequent antigen exposure, the population of memory T cells accumulates. This is the memory generation stage, which lasts from birth to about 20-25 years old, when our immune system encounter the greatest number of new antigen.[3][10] During the memory homeostasis stage that comes next, the number of memory T cells plateaus and is stabilized by homeostatic maintenance.[10] At this stage, the immune response shifts more towards maintaining homeostasis since few new antigens are encountered.[10] Tumor surveillance also becomes important at this stage.[10] At later stages of life, at about 65-70 years of age, immunosenescence stage comes, in which stage immune dysregulation, decline in T cell functionality and increased susceptibility to pathogens are observed.[3][10]