The growth rate of the genome-reduced strains correlates to the synthesis of ribosomal proteins. (A) Relative proteome fractions of the four major groups of genes involved in translation (ribosomal proteins, aminoacyl-tRNA synthetases, translation factors, and other proteins involved in translation) of the three genome-reduced strains Δ6, PG10, and PS38. (B) Fraction of ribosomal proteins as function of the growth rate (doubling times/hour). The proteome fraction and the doubling time show a linear correlation (black line).