B cell activation, animation. B cells, or B lymphocytes, are a type of white blood cell and part of the immune system. Each B cell has a unique antigen-binding receptor (orange) on its surface. When the receptor binds its antigen it activates the B cell and triggers its proliferation. Each new B cell is a clone of the original and so carries the same receptor. The majority of the new B cells are plasma cells. These are B cells that secrete antibodies, which bind to the same antigen as the B cell receptor. When activated in a germinal centre, for example in a lymph node, some of the B cells will become memory B cells. These are long-lived cells that are able to mount an immune defence if there is a second exposure to the antigen. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Biocosmos / Francis Leroy & Marie Martinache |
Modell-Rechte: | nicht erforderlich |
Länge: | 29 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |