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Duplexes formed between the 5ʹ UTR and nascent transcript at the M TRS-B (above) or the E TRS-B (below) of different lengths. The nascent strands are shorter on the left. The free energy for the secondary structure is given above. CS-L – proposed leader core sequence in the 5ʹ UTR, cCS-B – Sequence complementary to the core sequence in the body, SL1 – Stem-loop 1, SL2 – Stem-loop 2, SL3 – Stem-loop 3
