C. elegans flp-gene sequelogues in 17 nematode parasites. Grey boxes indicate the presence of a flp gene sequelogue, as identified via BLAST, in selected nematode species. Search queries employed and the flp genes identified are detailed in Supplementary Table 2 and Supplementary Figure 1, respectively. Sequelogues of all C. elegans flp genes were also identified in the genomes of Caenorhabditis japonica, Caenorhabditis brenneri, Caenorhabditis remanei and Caenorhabditis briggsae. C-terminal FLP motifs are presented in single letter notation; X, denotes variable amino acid Xo, denotes hydrophobic amino acid; Xi, denotes hydrophilic amino acid.