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The cytoplasm of NRK cells behaves as a viscous fluid when the strain rate is very low (V/a < 0.1 s−1). When we drag a 1.5-μm-diameter bead at the speed of 0.1 μm/s the resistant force roughly remains constant with increasing displacement. Through the Stokes equation, the effective viscosity is 12.1 ± 6.3 Pa·s (n = 15, mean ± SD).
