In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 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 .
C / EBPbeta

 Reactivity with the tegument protein encoded by UL21 was identified for an additional patient .
tegument protein

 In contrast to previous studies performed in the absence of exogenous IL - 2 , no increase in binding of CREB to a 32P - labeled oligonucleotide probe was observed by electrophoretic mobility shift assay .

IL - 2