5C stands for "Chromosome conformation capture carbon copy". It is an extension of the original 3C technique that studies 3-dimensional organisation and interaction of chromatin in a cell. It detects interactions among all loci by ligating universal primers to all fragments. As a result, the whole genome is covered, albeit at a relatively low coverage. The 5C technique overcomes the junctional problems at the intramolecular ligation step and is useful for constructing complex interactions of specific loci of interest.