Caption: Human T lymphocyte (T cell). Lymphocytes are involved in the specific immune response and are composed mainly of precursor T cells and B cells (pre-T cells and pre-B cells). Pre-T cells and pre-B cells are subsets of lymphocytes that originate in the red bone marrow from hematopoietic stem cells. Pre-T cells circulate in the blood before migrating to the thymus where they develop into specialized cells (helper T cells and killer T cells) that are able to identify antigens and infected tissue.
Magnification*: x2,600
Type: SEM
Keywords: 20330B.TIF human body blood human white blood cell T lymphocyte T cell helper T cell killer T cell pre-T cell leukocyte T-lymphocyte SEM |

*(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)