The T Cell Activation/Expansion Kit was developed to activate and expand human T cells. The kit consists of Anti-Biotin MACSiBead Particles and biotinylated antibodies against human CD2, CD3, and CD28. Anti-Biotin MACSiBead Particles loaded with the biotinylated antibodies are used to mimic antigen-presenting cells and activate resting T cells from PBMCs as well as purified T cells. T cell expansion is achieved by culturing and reactivation at day 14 of culture.