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Cryogenic TEM micrographs of CLK3 ([CLK3] = 440 μM) in H2O at different cross-linking time and their corresponding histograms of the contour length of randomly selected 100 fibers for (a) 0 h, (b) 4 h, (c) 8 h, and (d) 24 h of UV light irradiation, respectively.
