Repressor

A repressor is a protein that turns off the expression of one or more genes. The repressor protein works by binding to the gene's promoter region, preventing the production of messenger RNA (mRNA). Courtesy: National Human Genome Research Institute

biology | genetics | repressor | protein | promoter | gene

View and download full-sized image.
Source: .
http://www.genome.gov/
License: Public Domain. If you are going to redistribute this image online, a hyperlink to the above source page is mandatory.