Fig 7. Growth of structures with constant subunit concentration.

(A) Schematic representation of the growth of two structures, where the cell maintains a fixed cytoplasmic density of subunits. (B-C) Size-dependent negative feedback enables robust size control of two structures with (C) or without (B) inherent difference in bare growth rates. The steady-state size distributions for the two structures in (B) and (C), computed analytically by solving the master equation. (D) The constant subunit concentration model does not lead to any scaling between the structure size and the system size, when multiple structures growing from a shared subunit pool. The plot shows time series for the size of 10 (green), 20 (yellow) and 40 (red) structures grown from a pool of concentration ρ = 2, with κ = 100.