paxillin

Paxillin is a specialized protein used almost exclusively in cellular biology and biochemistry. It functions as a molecular scaffold, meaning it does not catalyze reactions itself but provides a physical structure that brings other proteins together to facilitate cell signaling and movement.

As a technical term for a specific protein, it is treated as an uncountable mass noun in scientific literature. Researchers refer to the presence, expression, or localization of paxillin rather than counting individual molecules of the protein.