Long-Lived Plasma Cells who wander into your bone marrow and as their very creative name suggests, they live pretty long. Instead of vomiting out as many Antibodies as they can, they make themselves comfortable and find a home where they will stay for months and years. From there they constantly produce a moderate amount of Antibodies. So their entire job is to make sure that specific Antibodies against enemies we fought off in the past are always present in your bodily fluids. If the enemy shows up ever again, it will immediately get attacked by these antibodies and probably has no chance to
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