Membrane protein

Proteins that are part of, or interact with, biological membranes

Membrane protein

Membrane proteins are common proteins that are part of, or interact with, biological membranes. Membrane proteins fall into several broad categories depending on their location. Integral membrane proteins are a permanent part of a cell membrane and can either penetrate the membrane (transmembrane) or associate with one or the other side of a membrane (integral monotopic).

From Wikipedia, under CC BY-SA. More on occurri.