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Expression levels of ten reference genes (ACTB, B2M, GAPDH, TUBB2a, HPRT1, SDHA, TBP, YWHAZ, CYC1, GUSB) in HepG2 (a) and L02 (b). Squares in the middle of the box represent the mean values, horizontal lines in the box represent the median, and whiskers represent the highest and lowest values.
