Nature Chemistry 6, 435–440 (2014); published online 23 March 2014; corrected after print 6 May 2014.

The raw data including sequencing files (fastq format), processed data including counts of modified bases for each library preparation (reduced, oxidative and simple bisulfite) and the estimation of significant sites as reported in the paper, together with some explanation and a summary of the experimental and analytical protocols, are available here: http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE56572