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Schematic representation of the pre-mRNAs of different SHMT1 and SHMT2 transcripts. Non-coding exons are colored in light blue, coding exons in dark blue and introns are represented as thin light blue lines. The 5′UTR sequences selected for the experiments, composed by the indicated exons, are shown in the inset. UTR1 = (NM_004169-NM148918: Ex1_21–192+Ex2_1–19). UTR2 = (NM005412:Ex1_1–205). UTR2αsh = (NM_001166359: Ex1_1–93+Ex2_1–30). UTR2αint = (NM_001166358: Ex1_1–200+Ex2_1–30).
