title: The echinoid immune system revisited.
authors.forename: D A
authors.initials: DA
authors.lastname: Raftos
authors.forename: R L
authors.initials: RL
authors.lastname: Raison
mesh_terms: D000818:Animals; D004447:Echinodermata / Q000276:immunology*; D008285:Major Histocompatibility Complex; D008954:Models, Biological; D010802:Phylogeny