The murine Hmga1 coding sequence is under the control of the murine H2-K promoter and immunoglobulin mu intronic enhancer which drive expression in B and T cells. Western blot analysis confirmed increased protein levels of Hmga1 in splenocytes. Seven lines were generated and the pound symbol (#) is used because line numbers are not specified although the line with 20 copies of the transgene is used most often.