Fichtelius, K E The phylogenetic occurrence of lymphocytes within the gut epithelium. [electronic resource] - International archives of allergy and applied immunology 1969 - 119-33 p. digital Publication Type: Journal Article ISSN: 0020-5915 Standard No.: 10.1159/000230165 doi Subjects--Topical Terms: AmphibiansAnimalsAntibody FormationBasement Membrane--cytologyBiological EvolutionBirdsBlood Cell CountBursa of FabriciusChickensChild, PreschoolDucksEpithelial CellsFishesHumansIntestinal Mucosa--cytologyLymphocytesMiceMicroscopyRabbitsRatsReptilesSwine