Now scientists realize there may be as many as a hundred or more variations of a given receptor protein.

There are three different receptor proteins at work in sour taste.

At this stage, no special receptor proteins are involved.

CD47 has been demonstrated to be a ligand for this receptor protein.

It could also be seen as the total number of receptor proteins in a certain organism.

Because there are similar receptor proteins in human lungs.

Such receptor proteins, if they exist, would play a major role in recognizing and differentiating odors.

These molecules are then picked up by receptor proteins on the surface of the second cell.

Viruses often require receptor proteins on host cells to which they specifically bind.

The technique enabled the researchers to study the action of antibodies known to be involved in Graves' disease on the receptor protein.