Which extracellular matrix glycoprotein is a marker for nutrition due to its role in adhesion, migration, growth, and differentiation?

• A. Laminin
• B. Collagen
• C. Elastin
• D. Fibronectin

Answer: (D)

Fibronectin is the extracellular matrix glycoprotein that best supports adhesion, migration, growth, and differentiation. It acts as a key adhesive substrate for cells by binding to integrin receptors on the cell surface, allowing cells to attach, spread, and move. It also forms a flexible scaffold that coordinates interactions with other matrix components and growth factors, helping cells receive signals that promote proliferation and specialization during development and healing. While laminin, collagen, and elastin have important structural or basement-m membrane roles, fibronectin uniquely orchestrates adhesion and directed cell movement that underlie tissue nourishment and remodeling, making it the most fitting marker in this context.