Noggin, a known inhibitor of BMP4, is found within the matrix cells of the hair bulb.

Watercress is a known inhibitor of the cytochrome P450 CYP2E1, which may result in altered drug metabolism for individuals on certain medications such as chlorzoxazone.

The investigational drug Debio-025 is a known inhibitor of the protein cyclophilin D, which regulates the swelling of mitochondria in response to cellular injury.

Both are potent known inhibitors of pancreatic secretion.

Despite the difficulties, there are several known inhibitors of DnaG that are not NTP analogues.

Some known inhibitors of AO are sterol and phenol compounds, like estradiol.

Cells also showed decreased levels of mTOR, a known inhibitor of macroautophagy.

Pyrethroids are usually combined with piperonyl butoxide, a known inhibitor of key microsomal oxidase enzymes.

Of the known inhibitors of alternative oxidases, the antibiotic ascofuranone inhibits the T. brucei enzyme and cures infection in mice.

The effect could be blocked using atropine, a known inhibitor to heart vagal nerve stimulation.