(biochemistry) Any of a class of proteins, found in cell membranes, that pass signals between hormone receptors and effector enzymes

(biochemistry) The binding of phosphate to proteins to form phosphoproteins.

(informal, biochemistry) Any protein that normally exists combined with another entity (metal, carbohydrate or lipid etc), free from its normal attachment.

(biochemistry) Any of a family of small proteins that attach themselves to other proteins within cells and modify their function

(countable or uncountable) A protein found in leaves extracted for use as a food for humans.

A protein found on the surface of many mammalian cell types, especially neurons. The normal function of the prion protein is not known.

A protein as it is being formed by a ribosome before it folds into its active shape.

(biochemistry) A group of two or more associated proteins that remains stable over time.

plural of protein complex

(biochemistry) Any protein that consists of both a polypeptide (the apoprotein) and a prosthetic group such as a lipid (in lipoproteins), sugar (in glycoproteins) or porphyrins and metals (in hemoglobin etc)