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Schematic representation of α1(I), α2(I), α1(II), and α1(III) collagen chains where potential MMP cleavage sites are indicated by gray lines, MMP cleavage sites are indicated by black dashed lines, Lys-Gly-(Asp/Glu) sites are indicated by green lines, and Gly-(Asp/Glu)-Lys sites are indicated by red lines. Numbering begins at the N terminus of the triple-helical region of each collagen. The distance between motifs and cleavage sites are not to scale.
