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. 1997 Oct 6;139(1):1–12. doi: 10.1083/jcb.139.1.1

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Young modulus measurements: deformation of the chromosome inside the pipette under aspiration. Deformation is measured as a function of the pressure difference (ΔP) between inside the pipette and the culture medium. From top to bottom: (a) ΔP = 0; (b) ΔP = 44 Pa. Arrows indicate the tip of the chromosome. Bar, 5 μm.