Task: Named Entity Recognition
Input (English):  To directly examine the effect of 1 , 25 - ( OH ) 2D3 on T cell activation in the absence of other complicating interactions , we utilized a panel of cloned Ia - restricted T cell hybridomas that secrete IL 2 on activation by cloned Ia - bearing stimulator cells ( TA3 ) or when stimulated by mitogen .
Output (English): IL 2