HiFi sequencing produces long, accurate reads of the 4 DNA bases — A, C, G, and T — that deliver the most comprehensive characterization of genomes. But HiFi sequencing is not limited to characterizing the genome. It simultaneously measures the epigenome by detecting a fifth base — 5mC at CpG sites — without requiring special library preparation like bisulfite treatment. This detects distinct regional epigenetic patterns, accesses methylation in the full genome, and identifies allele-specific methylation.