FIG. 2.

Direct exposure of C. elegans to cyanide gas. Wild-type (□) or egl-9 (○) nematodes were exposed to 1 μmol (A) or 4 μmol (B) of cyanide gas in sealed 10-cm-diameter petri plates. Worms were considered dead if they did not respond detectably when the assay plate was tapped repeatedly against the microscope stage. Each datum point represents the average level of killing based on three separate assays.