In immunology, reactive lymphocytes, variant lymphocytes, atypical lymphocytes, Downey cells or Türk cells are cytotoxic (CD8 +) lymphocytes that become large as a result of antigen …

Jul 24, 2025 · A blood test showing reactive lymphocytes indicates an active immune response within the body. These specialized white blood cells, specifically lymphocytes, become …

Nov 22, 2025 · A “reactive lymphocyte” is a lymphocyte that has undergone a physical change in response to an active immune challenge. The term signifies that the immune system is …

Oct 11, 2024 · Lymphocytes that come from more than one cell are considered “reactive,” so they typically point to an infection. Lymphocytes that are clones of a single cell, on the other hand, …

Jun 10, 2025 · Atypical lymphocytes are reactive, morphologically altered lymphocytes (mainly activated T cells) that appear in the peripheral blood. They indicate an active immune …

Reactive lymphocytes are defined as lymphocytes that exhibit prominent dark-blue cytoplasm due to increased protein synthesis and mRNA, and may undergo blast transformation with a …

Mar 1, 2016 · Reactive lymphocytes show a range of morphologic features. Reactive lymphocytes with immunoblast-like morphology are large cells with high nuclear-cytoplasmic ratios, …

Atypical lymphocyte refers to unusual structure of lymphocytes that are a part of the cell mediated immune system of the body. Also referred to as reactive lymphocytes, atypical lymphocytes …

Reactive lymphocytes are seen in peripheral blood as a response to antigenic stimulation. Thus, they are more frequently in younger animals, who are antigenically naive.

Dec 8, 2025 · There are several types—called T cells, B cells, and natural killer (NK) cells—that support the immune system in different ways. The main function of lymphocytes is to …