The transcriptional regulation, <i>p</i>_{E_A}, that maximizes the growth rate of figure 2 (solid) and the corresponding actual enzyme production rate, <i>p</i>_{E_A} (dot-dashed), in units of molecules per cell and second.

<p>Also shown are the growth rate as fraction per hour (dashed, right scale) and the cost of producing the enzyme E_A, expressed in terms of the total resource expenditure (dotted line, right scale).