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.

 gp170 is expressed at a level 30 to 50 % of the Env precursor gp130 .
Env precursor

 Base substitutions within this NFIL - 6 site resulted in virtual elimination of LPS - induced IL - 1 beta gene transcription .
IL - 1

 Transcription start sites of sal and salR genes were determined to lie 30 - and 24 - bp upstream of the respective initiation codons and separated from each other by 78 nucleotides .

salR genes