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RT-PCR analysis of gene expression during differentiation. A. Delayed induction of the RARβ2 gene. Aliquots of the PCR reactions made with RNA from the day shown above each lane were electrophoresed, blotted, and hybridised with an internal oligonucleotide probe for the RARβ2 gene. B. Aliquots of the PCR reactions performed with the same RNA samples as in panel A were analysed by electrophoresis on an agarose gel and staining with ethidium bromide.
