Time-evolution of the viscoelastic response of untreated cytoplasmic extracts, with measurements taken every 2–3 min with ω = 1 rad/s and γo = 0.05. Each curve represents an independent measurement, showing the variation in the response. In all cases, the extracts form weak viscoelastic solids, with elastic moduli G′ (top, solid symbols) in the range of 2–10 Pa, and viscous moduli G″ (bottom, open symbols) in the range of 0.5–5 Pa.