English: csrA mutant cells are grown on an agar pad and form a microcolony under the microscope. Movie of a growing microcolony of the csrA mutant. Time between frames is 5 minutes; the timer indicates hh:mm:ss. The red dot marks the cell pole of one individual (‘Individual A’) throughout the movie. This individual is born at time 01:54:00, when the marked pole becomes the older cell pole (before birth, the cell pole is marked by an empty red dot). At the time of birth, the chronological age of the individual is 0:00:00 hours, and its replicative age is 0 divisions. Individual A divides three times in the course of 1:46 hours and then stops. At the last division, it produces a rejuvenated progeny, individual B (marked by an empty blue dot before birth, and by a full blue dot afterwards). Individual B is born at time 03:40:00 and divides four times before the movie stops.