CCT: a coordinate conversion tool for hepatitis B virus

The hepatitis B virus (HBV) genome has ∼3 200 nucleotides, coding for seven proteins in four overlapping open reading frames (ORFs). Comparison of genomic coordinates between different samples and/or published literature requires manual conversion. An online tool is presented to convert nucleotide or amino acid positions between ORFs, regions and domains of the HBV genome. The user enters a position into an interactive web page, which then shows this position in all other applicable ORFs, regions or domains and plots it on a diagrammatic representation of the HBV genome. This tool assists researchers to convert coordinates, thereby facilitating comparisons between samples.