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


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


question:
 Using the specific pharmacological inhibitors of PI 3 - kinase , Wortmannin and LY294002 , we demonstrate that PI 3 - kinase activity is vital for BCR - induced NF - kappaB DNA - binding activity .
answer:

NF - kappaB