Culture growth of the following strains or pairs thereof. The bold line indicates the total number of cells, while the yellow and blue areas indicate the proportion of H⁻ and T⁻ cells, respectively. The error bars indicate the standard deviation of three replicas of the experiment. H⁻ and H⁻ Trp-SecretionI cells are shown in yellow, and the T⁻ cells (fed population) are shown in cyan. Panels correspond to cultures of the following strains: (a) T⁻; (b) H⁻, (c) T⁻ and H⁻; (d) H⁻ Trp-secretionI; (e) H⁻ Trp-secretionI and T⁻.