The 80S ribosome bound to the mRNA moves along the mRNA molecule from its initial site to the initiation codon and forms a 48S complex, in which the initiation codon is base paired to the anticodon of the Met-tRNAi. Proper recognition of the AUG initiation codon depends on base pairing with the anticodon of the Met-tRNAi and requires eIF1, eIF1A, eIF2 and eIF5.
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