A

26-year-old man is brought to the hospital in a very serious condition after a

motorcycle accident. The cause is massive bleeding into the abdominal cavity.

During surgery, a splenectomy (removal of the spleen) is performed due to a

rupture. The patient is subsequently instructed that life without a spleen does

not bring significant limitations. However, the immune system weakens and the

body´s defense against encapsulated bacteria deteriorates, so vaccination

against them is recommended. In which part of the spleen are the B-lymphocytes

and plasma cells that produce antibodies against these bacteria?