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During the posttranscriptional processing of pre-mRNA, a 5' cap is added to an mRNA. Arrange the following steps of the capping process in the CORRECT order. 1. Addition of a guanine nucleotide via a 5'-5' bond
2) Removal of a phosphate from a ribonucleotide triphosphate at the 5' head of the pre-mRNA
3) Methylation at the 2' position of the sugar in the second and the third nucleotides
4) Methylation at position 7 of the terminal guanine base
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