title: Heligmosomoides polygyrus: one species still.
authors.forename: Rick M
authors.initials: RM
authors.lastname: Maizels
authors.forename: James P
authors.initials: JP
authors.lastname: Hewitson
authors.forename: William C
authors.initials: WC
authors.lastname: Gause
mesh_terms: D000818:Animals; D006369:Heligmosomatoidea / Q000145:classification* / Q000235:genetics; D010802:Phylogeny; D013045:Species Specificity