Integrative Conjugative Elements (ICEs)

Chromosomally located gene clusters that encode phage-linked integrases and conjugation proteins as well as other genes associated with an observable phenotype, such as virulence or symbiosis. They can be transferred between cells and have some phage-like genes, but they do not lyse the cell or form extracellular particles; see http://www.nature.com/nrmi-cro/journal/v3/n9/glossary/nrmicro1235_glossary.html (accessed June 16, 2010).