Fig. 7. PAL-1 target genes likely involved in patterning are expressed in four temporal phases. Wild-type temporal expression patterns are plotted for 13 validated target genes that encode 11 transcription factors, a wingless ligand (cwn-1) and a novel protein (mab-21) known to be involved in a cell fate switch in the male tail. Developmental stages are indicated as the number of C-lineage cells across the top of the graph, and the phase each gene belongs to is indicated by color (based on when zygotic expression is first detected). vab-7 is omitted from the graph because it is not detected in wild type by microarray, but we know it is a phase II gene based on lacZ reporter and in situ hybridization (Ahringer, 1996), as well as its detection in the mex-3(zu155); skn-1(RNAi) timecourse data.