Ribosome shunting
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Ribosome shunting is a mechanism of translation initiation in which ribosomes physically bypass, or shunt over, parts of the 5' untranslated region to reach the initiation codon. This enables viruses to have more information than usual in an mRNA molecule.
[edit] Source
http://ntbiouser.unibe.ch/trachsel/teaching/translation/initiation/Ribosomal_shunt_pathway.htm