FIG. 1.

Transcriptional organization and temporal expression of T3S operons. For each operon, the promoter location is indicated by a bent arrow, followed by a dashed line above each gene in the operon, and the arrowheads indicate the temporal expression patterns of the first gene in each operon, as noted on the figure. Genes or open reading frames are identified by name or number, respectively, below the large filled arrows, which are color coded according to functional class. An unrelated function is one not involved in T3S.