Figure A1.

(a) Snapshot of the interfacial region between the two coexisting phases of a 6-component mixture. The order parameter distinguishes between proteins (in grey) of both phases by evaluating the number of neighbours that each protein has for a given cut-off distance. For considering a protein belonging to the condensed phase, it needs to have at least 2 neighbours (independent of its valency) within a cut-off distance of $r_{\mathrm{cut}-\mathrm{off}}=1.20\sigma$. (b) Percentage of mislabelled proteins as a function of the number of neighbours in the diluted (purple curve) and in the condensed phase (orange curve) for a cut-off distance of $1.20\sigma$. Both curves (phases) were evaluated in bulk $NVT$ simulations at the coexisting density and composition of the ‘valency-driven binding’ system at $T^{*}$ = 0.09.