Fig. 1. Lineages of hypodermal cells in heterochronic mutants. Schematics of post-embryonic cell lineages for lateral (seam; Vn=V1-V4 and V6) and ventral (Pn=P3-P8) cells are shown for animals of each genotype indicated. Vulva precursor cells (VPC) are the posterior daughters of P5-P7. A horizontal line depicts cell division. To the left in each set of lineages are indicated the cell-type specific lineage pattern interpreted from the data: 1, L1-specific cell lineage pattern (etc.); A, adult. 2/3 and 4/A indicate that cells at the indicated stage may execute a mix of alternative fates (see text). Broken lines indicate cells not depicted. Three horizontal lines indicate fusion of seam cells and secretion of adult lateral alae. The anterior daughters in Vn (seam) lineages, indicated by short lines, appear to fuse with the main hypodermal syncytium. Wild-type and lin-28(lf) lineages are taken from previous studies (Sulston and Horvitz, 1977; Ambros and Horvitz, 1984).