Heterozygotes are WT and segregate WT, Unc, Ste/Mel, and dead eggs. ssl-1(n4077) deletion removes 683 nucleotides from the ssl-1 locus (Y111B2A.23). Relative to the first nucleotide of the predicted initiator ATG, the deletion begins at about nt. 5075 and ends at about nt. 5757 to give the junction sequence GATATACAC/AGACCTAAT.