title: Invertebrates: Why No Adaptive Immune System?
authors.affiliation: Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa.
authors.forename: G
authors.initials: G
authors.lastname: van Niekerk
authors.affiliation: Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa.
authors.forename: S M
authors.initials: SM
authors.lastname: Hattingh
authors.affiliation: Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa.
authors.forename: A M
authors.initials: AM
authors.lastname: Engelbrecht
mesh_terms: D056704:Adaptive Immunity; D000818:Animals; D005075:Biological Evolution; D005502:Food; D005854:Germ Cells / Q000502:physiology*; D006801:Humans; D007107:Immune System