Metastable equilibrium abundances of reference model proteins and proteins as a function of oxygen fugacity. The relative abundances of five proteins localized to ER to Golgi whose experimental abundances were reported in  were calculated as a function of log at 25°C and 1 bar and with total activity of amino acid residues equal to unity. The rightmost dotted line indicates conditions where the calculated abundance ranking of the proteins is identical to that found in the experiments, and the leftmost dotted line where the calculated logarithms of activities have a lower overall deviation from experimental ones, which are indicated by the points. This value of log (-78) was used to construct the corresponding diagram in Fig. 5.