A murine monoclonal antibody directed against the beta subunit of the interleukin-2 receptor (IL-2R), expressed on resting T-lymphocytes, natural killer (NK) cells, and some leukemic cell types. Monoclonal antibody Mik-beta-1 prevents the binding of IL-2 to IL-2R beta, thereby inhibiting the IL-2-mediated proliferation and activation of T-cells. Check foractive clinical trials using this agent.