molecule with an optical tweezer -rap center XY stage Laser light The force-extension curve of a single collagen ll 50100150200150300 Extensions(nm) Table 22-4. Major Collagen Molecules Type Molecule Composition Structural features Ial(Dl[a2(D1 300-nm-long fibrils Skin tendon bone ligaments, dentin. 300-mmm long fibrils Le, vireou 00-lnm-long fibrils: often Skin, muscle blood v Ial(v)l 390-pm-long fibrils with vi [a levI a(VI) Lateral association with type Most mt Ix [aI(LX)Il a2(x)ll a 3(Ix)| Lateral association with type Cartilage. humor iy la lvillazavol Two-dimensional network All basal laminae SOURCE: K Kuhn, 1987, in R. Mayne and R Burgeson, eds, Strcture and Functi Collagen Types. Academic Press, P. 2: M van der Res and R. Garrone. 19913