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.
Most antigens are proteins that serve as the stimulus to produce an immune response. The term antigen comes from ANTI-body GENerating substances. Here are the steps in an immune response: When an antigen is detected by a macrophage (as describe above under phagocytosis), this causes the T-cells to become activated.