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Translation initiation on poliovirus mRNA in poliovirus-infected cells has been shown to occur by internal binding of ribosomes to the 5' noncoding region (J. Pelletier and N. Sonenberg, Nature London 334:320-325, 1988). Here we show that internal ribosome binding can occur in HeLa cell extracts in vitro. Internal binding to the 5' noncoding region of poliovirus mRNA in a bicistronic context was independent of the upstream open reading frame and did not require poliovirus proteins.
Pelletier et al. (Sun,) studied this question.
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