title: Phylogenetic status of immune system in Xenopus.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D006084:Graft Rejection; D006648:Histocompatibility; D007125:Immunogenetics; D008722:Methods; D016038:Skin Transplantation; D014181:Transplantation Immunology; D014981:Xenopus