Inheritance during cell division. The numbers within the squares indicate actual quantities of comK transcripts and ComK proteins. Filled squares indicate the daughter cells that eventually exhibited the competence phenotype, and branch lengths reflect the time (in iterations) until competence was exhibited. Branch lengths of non-competent cells (unfilled squares) were artificially lengthened to make room for the labels; otherwise they would be of zero length. Cells that inherited quantities of ComK proteins and transcripts, combined with intracellular stochasticity, exhibited competence prior to cells that did not acquire ComK. The tree is drawn using R from data captured from the simulation after formatting in Newick tree format.