Fig. 3.

Individual aggregates are located to the old pole through cycles of cell divisions. Because movement of foci is rarely observed, the location of an aggregate within the cell after division is determined by its location in the mother cell. Those that were at the one- or three-quarter positions are found concentrated around the mid-cell point after division (Step I). Aggregates at the mid-cell are subsequently located in the new pole, with equal probability to be in either of the two cells (Step II). Those that are found in the new-pole end of the cell immediately before division remain in the same pole; however, that pole, having been formed in the previous division event, is now an old pole in the offspring cell (Step III). Note that aggregates can be initially detected at polar, mid-cell, or quarter-cell positions but are eventually located to an old pole. Once there, they are consistently inherited by the old-pole cell after division. Aggregates are indicated by green dots. Red cell ends are old poles, and blue cell ends are new poles.