Presence of coelomocytes in the primitive chordate amphioxus (Branchiostoma lanceolatum).
D000818:Animals; D000941:Antigens / Q000032:analysis*; D002816:Chordata, Nonvertebrate / Q000166:cytology / Q000276:immunology*; D007109:Immunity; D010587:Phagocytosis; D010802:Phylogeny
D000941:Antigens