A protein containing a metal or an organic prosthetic group, or both. For example, a glycoprotein is a conjugated protein bearing at least one oligosaccharide group.
A protein that is chemically linked with a nonprotein molecule. Included are chromoproteins (e.g., hemoglobin); glycoproteins (e.g., mucin); lecithoproteins, nucleoproteins, and phosphoproteins (e.g., casein).