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.

 Preferential transcription of HTLV - I LTR in cell - free extracts of human T cells producing HTLV - I viral proteins .
viral proteins

 Thus , the behavior of ZEBRA in human B cells and S . cerevisiae suggests that the protein contains universal activation motifs that interact with conserved components of the transcription machinery .
universal activation motifs

 Expression of the granulocyte - macrophage colony - stimulating factor ( GM - CSF ) gene in T cells is activated by the combination of phorbol ester ( phorbol myristate acetate ) and calcium ionophore ( A23187 ) , which mimic antigen stimulation through the T - cell receptor .

GM - CSF