let-99(dd17) contains a 647bp deletion with the flanking sequences aatttttaggaagtttccagaaatttttcc / CAAGGCTCCCACGAAGATTATCGCGATCTA. The deletion removes the N terminus of the open reading frame including the start codon and the DEP domain. Heterozygotes are GFP+ in the pharynx. dd17 is a maternal effect lethal mutation.