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USP4 is dispensable for melanoma cell proliferation. A and B, Cell proliferation of A2058 and 451Lu cells was measured by CCK‐8 assay at 0, 24, 48 and 72 h. The lower panel is the knockdown efficiency of USP4 expression. C and D, Cell colony formation of A2058 and 451Lu cells was measured by colony formation assay. Data are presented as the mean ± SD, ns, non‐significant; Student's t test
