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The process where the cap structure, composed of a 7- methylguanosine (m7G) group and associated cap-binding proteins, located at the 5\' end of an mRNA molecule, which serves as a molecular tag that marks the spot where the 40S ribosomal subunit, is recruited and will then scan in a 5\' to 3\' direction until an AUG codon is encountered in an appropriate sequence context to initiate mRNA translation. [PMID:17284590, PMID:19604130]
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