Task: Named Entity Recognition
Input (English):  Macrophage stimulation with Murabutide , an HIV - suppressive muramyl peptide derivative , selectively activates extracellular signal - regulated kinases 1 and 2 , C / EBPbeta and STAT1 : role of CD14 and Toll - like receptors 2 and 4 .
Output (English): C / EBPbeta