One who antagonizes or stirs.
An opponent or enemy.
A muscle that acts in opposition to another.
A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
The main character or force opposing the protagonist in a literary work or drama.
One who promotes.
One who promotes entertainment events or goods.
The section of DNA that controls the initiation of RNA transcription as a product of a gene.
An accelerator of catalysis that is not itself a catalyst.