This protein family represents a group of proteins from nematodes, including Excretory-secretory protein 2 from Ancylostoma ceylanicum (AceES-2), a highly immunoreactive molecule secreted by adult worms at the site of intestinal attachment. AceES-2 folds into a five-stranded beta-barrel flanked by short N- and C-terminal alpha-helices that lie parallel to each other on one side of the beta-barrel, adopting a netrin-like (NTR) domain, similar to the C-terminal domain of netrins [1].

1: Ancylostoma ceylanicum excretory-secretory protein 2 adopts a netrin-like fold and defines a novel family of nematode proteins. Kucera K, Harrison LM, Cappello M, Modis Y; J Mol Biol. 2011;408:9-17. PMID:21352830