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: Thymic cortex and medulla, germinal center, T zone  |  Cells types: professional and non-professional antigen-presenting cells APC and APC), plasma cells  |  Intracellular factors: NF-kB, foxp3  |  Cytokines: IFNg, IL-4  |  Surface molecules: TCR, BCR, CD19, CD20, MHC class I, MHC class II, CD25, CD4, CD8, CD28/B7, CD40/CD40L, Fas/FasL  |  Soluble molecules: Antibodies  |  V(D)J recombination, positive and negative selection, homing, activation, isotype switching, clonal expansion, immune memory