Number of putative FAR-encoding genes present in the genomes of various nematode species.

Species in order from left to right: Steinernema carpocapsae (Scar), Ancylostoma ceylanicum (Acey), Strongyloides stercoralis (Sste), Ascaris lumbricoides (Alum), Brugia malayi (Bmal), Caenorhabditis elegans (Cele), Dracunculus medinensis (Dmed), Haemonchus contortus (Hcon), Onchocera volvulus (Ovol), Nippostrongylus brasiliensis (Nbra), Trichinella spiralis (Tspi), Trichiuris muris (Tmur). T spiralis and T. muris have no known FAR encoding genes while S. carpocapsae shows the greatest expansion of FAR genes in its genome.