The clustering and aggregation of membrane rafts at a single cellular pole during activation of particular cell types, such as lymphocytes [goid 1766] [evidence IEA]; The directed orientation of T cell signaling molecules and associated membrane rafts towards a chemokine gradient or a contact point with antigen presenting cell [goid 1768] [evidence IEA]; The formation of an area of close contact between a lymphocyte (T-, B-, or natural killer cell) and a target cell through the clustering of particular signaling and adhesion molecules and their associated membrane rafts on both the lymphocyte and target cell, which facilitates activation of the lymphocyte, transfer of membrane from the target cell to the lymphocyte, and in some situations killing of the target cell through release of secretory granules and/or death-pathway ligand-receptor interaction [goid 1771] [evidence IEA]; The directed movement of a motile cell or organism, or the directed growth of a cell guided by a specific chemical concentration gradient. Movement may be towards a higher concentration (positive chemotaxis) or towards a lower concentration (negative chemotaxis) [goid 6935] [evidence IEA]; A process that is carried out at the cellular level which results in the formation, arrangement of constituent parts, or disassembly of cytoskeletal structures [goid 7010] [evidence IEA]; A process that is carried out at the cellular level which results in the formation, arrangement of constituent parts, or disassembly of cytoskeletal structures comprising actin filaments and their associated proteins [goid 30036] [pmid 12176041] [evidence TAS]; The process of sparing immature T cells in the thymus which react with self-MHC protein complexes with low affinity levels from apoptotic death [goid 45059] [evidence IEA]; The process of elimination of immature T cells in the thymus which react strongly with self-antigens [goid 45060] [evidence IEA]; The expansion of an alpha-beta T cell population by cell division [goid 46633] [evidence IEA]; The directed movement of a lymphocyte in response to an external stimulus [goid 48247] [pmid 11518968] [evidence ISS]