Outcomes for some mRNAs obtained by stochastic simulations of the model.

<p>Panels (<b>A</b>) and (<b>C</b>) show a sketch of the two different behaviours one can obtain for the density of ribosomes and the current , respectively. The genes are divided in two categories, according to the shape of , as shown in (<b>A</b>): <i>abrupt</i> mRNAs (red, colour online) present a steep increase of the polysome size with increasing the initiation rate. On the other and, <i>smooth</i> sequences (blue, colour online) do not show this feature. The current (<b>C</b>) is also affected, with <i>abrupt</i> genes exhibiting a sudden change, or ‘kink’ in the current, while the current of <i>smooth</i> mRNAs does not suddenly saturate. Panels (<b>B</b>) and (<b>D</b>) show the outcome of numerical simulations of real sequences from <i>S. cerevisiae</i>. Genes YGL103W and YBL027W are ribosomal proteins while YHR030C and YBL105C are kinase regulatory proteins. indicates the saturation value of the current (see text).