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    Area of Science:

    • Biophysics
    • Chemical Engineering
    • Soft Matter Physics

    Background:

    • Biomolecular condensates are dynamic cellular structures.
    • Their formation involves complex molecular interactions.
    • Understanding droplet size control is crucial for cellular function and synthetic applications.

    Purpose of the Study:

    • To investigate the role of opposing interactions in controlling biomolecular condensate droplet size.
    • To elucidate the mechanisms behind the coexistence of equally sized droplets at equilibrium.
    • To explore the impact of charge asymmetry and attraction strength on droplet size.

    Main Methods:

    • Molecular dynamics simulations were employed.
    • An equilibrium field theory was utilized.
    • Analysis focused on the interplay of short-ranged attraction and long-ranged electrostatic repulsion.

    Main Results:

    • Opposing interactions suppress coarsening, enabling uniform droplet size.
    • Charge asymmetry significantly influences droplet size control.
    • Droplets acquire a net charge by expelling ions, limiting indefinite growth.

    Conclusions:

    • Electrostatic effects are critical for regulating biomolecular condensate droplet size.
    • This mechanism is relevant for understanding cellular processes and designing synthetic patterns.
    • Charge asymmetry, not attraction strength, dictates equilibrium droplet size.