White blood cell,computer artwork. White blood cell (leucocytes) are rounded cells with microvilli projections from the cell surface. These microvilli may assist in cell motility. Lymphocytes are involved in the immune response,acting to protect the body against infection. Two main types of lymphocytes occur in the human body: T-cells and B-cells. T- cells (thymus-derived) track down and help to actively destroy foreign bodies. B-cells (bone marrow derived) identify foreign microorganisms and then make antibodies | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pasieka, Alfred |
Taille de l’image : | 5000 px × 5000 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |