http://en.wikipedia.org/wiki/Lymphocyte
Following activation, B cells and T cells leave a lasting legacy of the antigens they have encountered, in the form of memory cells. Throughout the lifetime of an animal these memory cells will “remember” each specific pathogen encountered, and are able to mount a strong and rapid response if the pathogen is detected again. The T Helper Cell is a sub-type of the T cell that is able to activate all these lymphocytes.
Following activation, B cells and T cells leave a lasting legacy of the antigens they have encountered, in the form of memory cells. Throughout the lifetime of an animal these memory cells will “remember” each specific pathogen encountered, and are able to mount a strong and rapid response if the pathogen is detected again. The T Helper Cell is a sub-type of the T cell that is able to activate all these lymphocytes.
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