A partial lineage to illustrate the cells where hlh-8 is expressed (dark black letters). hlh-8 is expressed in the embryonically born hmc, four enteric muscles (mu int L and R, mu sph and mu anal), M mesoblast and post-embryonically born M descendants (cc and vm and the precursors to the um and bwm). Founder cells are labeled in gray. Vertical lines represent cells and horizontal lines represent cell divisions. Dashed lines are used where division events are not shown. The vertical line on the left is not drawn to scale but indicates the embryonic (Emb) and post-embryonic (Post-Emb) stages during development. The number of each type of cell is indicated in parentheses if the number is greater than one. Abbreviations used: mu int L and R, left and right intestinal muscles; mu sph, anal sphincter; mu anal, anal depressor; hmc, head mesodermal cell; bwm, body wall muscles; cc, coelomocytes; vm, vulval muscles; um, uterine muscles.