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Schematic of the geometry near the initiation-termination end of a looped mRNA. The mRNA loop binding factors are shown in yellow and black, whereas a ribosome of radius a is situated at the initiation site (not drawn to scale). The values m and n correspond to the number of bases of the UTRs which are assumed to be relatively protein-free and have short persistence length ɛ. Here, the persistence lengths in the coding regions (thick curve, described by the TASEP) is ℓ ∼ a.
