Operator gene and Regulator gene

Operator gene noun - A gene that activates the production of messenger RNA by adjacent structural genes.

Regulator gene and operator gene are semantically related In some cases you can replace phrase "Regulator gene" with "Operator gene", this phrases are similar.

Regulator gene noun - A gene that produces a repressor substance that inhibits an operator gene.

Operator gene and regulator gene are semantically related in gene that makes repressor topic. You can use "Operator gene" instead a noun phrase "Regulator gene".