Figure 5.

Impact of nucleotide autocatalysis and catalysis of CO₂ fixation on protocell division rate and nucleotide concentration. Heat maps show (a) the number of protocell divisions per day and (b) the mean protocell concentration of nucleotides at equilibrium when varying the rate of nucleotide autocatalysis ($\log K_N^N$) and nucleotide catalysis of CO₂ fixation ($\log K_C^N$). Other parameter values are given in table 1. (Online version in colour.)