Repressor protein is produced by

Repressor protein is produced by Regulator.
A repressor, as related to genomics, is a protein that inhibits the expression of one or more genes. The repressor protein works by binding to the promoter region of the gene(s), which prevents the production of messenger RNA (mRNA). Repressor proteins are essential for the regulation of gene expression in cells.
A regulator protein that turns genes ON when it binds DNA is called an activator protein, and a regulator protein that turns genes OFF when it binds DNA is a repressor protein.