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Fig. 1. egl-1 is transcriptionally active in the NSM sister cells but not in the NSMs or undead NSM sister cells. (A) Merged Nomarski and epifluorescence image of the anterior bulb of the pharynx of a ced-3(n717) L1 larva carrying an integrated Pegl-1his24-gfp reporter construct (bcIs37). Pegl-1his24-gfp is expressed in the NSM sister cell but not in the NSM. The complete genotype of the animals scored was ced-3(n717); bcIs37. (B) Merged Nomarski and epifluorescence image of the anterior bulb of the pharynx of a ces-1(703gf); ced-3(n717) L1 larva carrying an integrated Pegl-1his24-gfp reporter construct (bcIs37). Pegl-1his24-gfp is not expressed in the undead NSM sister cell or the NSM. The complete genotype of the animals scored was unc-87(e1216) ces-1(n703gf); ced-3(n717); bcIs37.