Table 1.

Extracellular Matrix Proteins and Their Respective Structural Details^25–29

Matrix Protein	Approximate Molecular Weight (kDa)	Structural Details
Collagen, type I	450	Triple helical fibrils, 300 nm long
Collagen, type IV	180	400nm long chain with C-terminal globular domain, nonfibrillar
Fibrinogen	340	Trinodular rod, approximately 48 nm long and 7 nm wide
Fibronectin	440	Two subunits with an extended length 120-160 nm, each 60-70 nm long and 2-3 nm thick
Laminin	900	Cross-shaped, with long arm (80 nm in length) and three short arms (25-40nm in length)
Vitronectin	75	Globular shape ∼20nm, greater for multimeric units