LIFE SCIENCE

Detailed explanation-1: -Memory B cells can survive for decades, which gives them the capacity to respond to multiple exposures to the same antigen. The long-lasting survival is hypothesized to be a result of certain anti-apoptosis genes that are more highly expressed in memory B cells than other subsets of B cells.

Detailed explanation-2: -The human body is separated from the outside world by barrier surfaces that carry out many functions to promote human health. Memory T cells reside in these tissues, which consist mainly of the intestine, lungs, skin and genital surfaces.

Detailed explanation-3: -Individual nerve cells (called neurons) in the front part of the brain can hold traces of memories by themselves for up to a minute, perhaps longer.

Detailed explanation-4: -Instead, memory B cells are defined as long-lived and quiescent cells that are poised to quickly respond to antigen upon recall (2–5). Both memory B cells and antibody-secreting cells (ASCs) are the product of antigen activation and, most often, interaction with cognate T helper cells.