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.
Infection with viruses or bacteria triggers the immune system to release proteins called antibodies. The specific part of the virus or bacterium that triggers the antibody response is called an antigen. Once produced by the body (specifically, by the lymphoid tissue, which is part of the body's immune system), antibodies circulate in the bloodstream until they come into contact with an antigen.