Table 1.

Expression of HSN transcription factors in transcription factor mutant backgrounds

Strain	L.G.	Encodes	EGL-43 expression	HAM-2 expression	UNC-86 expression
egl-5(n945)	III	Hox	persists in HSNs	absent in HSNs	absent in HSNs
egl-43(n1079)	II	Zn finger	absent in HSNs, ADEs  and phasmid neurons	w.t.	w.t.
ham-2(n1332)	X	Zn finger	w.t.	absent HSNs	w.t.
unc-86(n946)	III	POU	w.t.	w.t.	absent in all UNC-86-expressing cells

L1 larvae carrying loss-of-function mutations in genes encoding HSN transcription factors were stained with antisera to EGL-43, HAM-2 (Materials and Methods),and UNC-86 proteins (Finney and Ruvkun 1990). Over 50 animals of each mutant background were stained with each antiserum. (L.G.) Linkage group for each gene. The cloning of egl-5, egl-43, and unc-86 were described in Wang et al. (1993), Garriga et al. (1993b), and Finney and Ruvkun (1990), respectively. The absence of UNC-86 expression in the HSNs of egl-5 mutants was first noted in Baumeister et al. (1996).