Figure 5.

Evolution of the phase-separated morphology of the field variable $\varphi \left(\mathrm{r},t\right)$ with the chemical reaction rate $\mathcal{R}\left(\varphi \right)=0$ for selected crowder concentrations. (A) At very low crowder concentrations ${\varphi }_{rib}=0.22$, the late-stage (${10}^4\tau$) coarsened morphology is on average round droplets, as usually observed in in vitro experiments; (B) an increase in crowder concentration ${\varphi }_{rib}=0.42$ results in smaller droplets being coarsened at late stage of the evolution of the field $\varphi \left(\mathrm{r},t\right)$; and (C) any further increase in the crowder concentration results in the morphologies taking labyrinthine patterns with a smaller characteristic wavelength reminiscent of arrested gel-like phases (see Supplementary Materials Videos S1 and S2). Refer also to [73] where similar observations have been recently experimentally verified in peptide/oligonucleotide complexes.