PCR and sequencing primers were designed with the Pyrosequencing Assay Design Software (Qiagen) to recognize part of the CpG islands in the putative regulatory regions of the miRNAs analyzed. These primers were used to amplify and sequence the bisulfite-modified DNA from neuroblastoma cell lines. Pyrosequencing assays were performed with a SPQ 96MA instrument (Qiagen) and sequencing reactions were performed with the Pyro Gold reagent kit SPQ 96MA, according to manufacturer's instructions. Sequencing data were analyzed using the Pyro Q-CpG software (version 1.0.9).
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