tests of cerebral lateralization. 1  sodium amytal test: anesthetize one hemisphere and check for language function. 2  dichotic listening test: report more digits heard by dominant half. 3  functional brain imaging: fMRI or PET used to see which half is active when performing a language test.
one of a large group of low-molecular-weight proteins secreted by various cell types and involved in cell-to-cell communication, coordinating antibody and T cell immune interactions, and amplifying immune reactivity. Cytokines include colony-stimulating factors, interferons, interleukins, and lymphokines, which are secreted by lymphocytes.
Key Points. 1  Helper T cells secrete small proteins called cytokines that regulate or assist in the active immune response by activating other immune cells. 2  Cytotoxic T cells (TC cells, or CTLs) destroy virus-infected cells and tumor cells, and are implicated in transplant rejection and autoimmune disease.