The protein serves a protective function by binding to pathogens and also functions in a cell signaling capacity.

These proteins serve as scaffolds on which intracellular signaling and protein trafficking are organized.

Only proteins can serve as immunogens for cell-mediated immunity.

The same proteins that will lead to the end of a cell's life serve to protect the body as a whole.

The proteins served as gates or channels through which only certain ions were allowed to pass.

The proteins serve to emulsify the lipid (otherwise called fat) molecules.

In its healthy, nonmutant form, the protein serves as the breast's way of protecting itself against unruly cell division.

Thirdly, in animals, some proteins serve as hormones, such as growth hormone.

Finally, proteins may also serve as energy sources.

The protein encoded by the this gene serves as a cardiac biomarker.