To obtain a survey of MurG-YFP distribution in a population of sporulating cells, starting at T3, we acquired images at half hour intervals from cells in resuspension medium. MurG-YFP also had a clear membrane-like distribution starting around T3.5 of sporula-tion (Fig. 1C and E) and MurG-YFP signal both qualitatively and quantitatively accumulated at the spore over the course of sporulation, reaching its maximum after engulfment with a spore/mother cell fluorescence ratio of 2.81 _.40 around T4.5 (Fig. 1C, D and F). Control cells expressing free CFP (JDB2157) showed no particular accumulation of fluorescence, or enrichment at the spore (Fig. 1D, S1A, S1B).