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(a) Representative EM images of negatively stained PSC. (b) Distribution of diameters of negatively stained PSC (n = 235). (c) Mass distributions of STEM analysis of PSC alone (n = 515). (d) Summary of measured masses of PSC. (e) Mass distributions of STEM analyses. Measured masses for 4N and 4N + PSC are 0.97±0.01 MDa (n = 130) and 1.67±0.03 MDa (n = 86) respectively.
