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Cytoarchitecture of the thymus gland of the adult frog (Rana temporaria).

Like in other jawed vertebrates, the frog thymus consists of lymphoid cells within epithelial framework and characteristic myoid cells. Mammalian type Hassall's corpuscles are absent, but degenerative cells form so-called unicellular Hassall's bodies. Conspicuous secretory cells, secretory and degeneration cysts as well as phagocytic cells, granulocytes and plasma cells can be observed in the frog thymus. Interdigitating-like cells and some characteristic features of thymic vasculature (i.e. the existence of blood-thymus endothelial are preliminary described in the frog thymus.