Viability of full and regenerating worms. The lethality of each chemical is shown as the fraction of dead worms (Fdead) after 2, 4, 8, or 15 days of exposure to: A, DMSO, B, permethrin, C, chlorpyrifos, D, dichlorvos, E, ethanol, F, methanol, G, SDS, H, TritonX-100, I, acrylamide, and J, glucose for full (black) and regenerating (gray) worms. Solid black and gray dashed lines show the result of the fit, as described in “Materials and methods” section, for full and regenerating worms, respectively.