title: A search in asterias and ascidia for the beginnings of vertebrate immune responses.
mesh_terms: D000818:Animals; D016798:Ciliophora / Q000276:immunology; D013215:Starfish / Q000166:cytology / Q000276:immunology*; D014561:Urochordata / Q000166:cytology / Q000276:immunology* / Q000382:microbiology; D014733:Vibrio / Q000254:growth & development