Ribosomal Binding Site

A ribosomal binding site (RBS) is a sequence on mRNA that is bound by the ribosome when initiating protein translation. The ribosome usually starts searching for its site at one end of the mRNA but in some cases, particularly with viruses, there is an internal site called an internal ribosome entry site (IRES).
 * In prokaryotes it is called the Shine-Dalgarno sequence.
 * In eukaryotes it is called the Kozak consensus sequence.