FIG 2 .

Slf induces the switch from rods to cocci in a single growing colony. Purified Slf was placed 1 cm from the edge of the colony 4 days after inoculation. (A) Coccus colonies (arrows) in the inhibited regions 4 weeks after Slf introduction. (B) Higher magnification of the marked rectangle in panel A. Dead bacteria are visible in the inhibited region near coccus colonies. Rods are swarming from the edges of the coccus colonies. (C) The number of bacteria in each zone, 3 days after introduction of Slf, was determined as described for Fig. 1E.