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Quality assessment of RNA samples of the BRO Biobank after at least 2 years of storage: (a) 1.5% nondenaturing agarose gel electrophoresis of RNA samples; (b) 2.5% agarose gel electrophoresis of RT-PCR amplification of a region of GAPDH gene using RNA samples of the BRO Biobank as templates. M: molecular weight marker (0.1–10 kb); R1, R2, and R3: RNA samples.
