Figure 2: Measurement of viscosity from stress relaxation data in pig tissue. (a) Example viscosity data derived from stress relaxation in a fiber untreated (CTRL, black) and in presence of recombinant PEVK protein (+PEVK, gray). Inset: schematic of explaining how viscous stress (σ v) was determined. (b) Exogenously added PEVK reduces the viscosity (slope) by 35%. See text for details.