The distributed genome hypothesis. (a) Schematic showing the distributed (non-core) genes of a species supragenome in a population pool with individual strains below each containing the same set of core genes (green helix). (b) Schematic showing each of the strains of a species with the core genome and a unique distribution of non-core genes.
Ehrlich et al. Genome Biology 2008 9:225 doi:10.1186/gb-2008-9-6-225