Dynamics of the mechanical properties of a plasma clot was measured using a torsion pendulum. Samples for measurements were prepared as described in “Polymerization mixture and gel point measurement.” (A) Storage modulus (G′) or stiffness (■). (B) Loss modulus (G″) or inelastic component (■). (C) Tangent (δ = G″/G′) (■). (D) Turbidity (■). The error bars represent 1 standard deviation. G′ and G″, which represent stiffness and inelastic component, respectively, reached a plateau after polymerization was completed, as represented by turbidity curve. Tan δ, which is the ratio of G″ and G′, reached a plateau also after polymerization was completed.