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Ultrastructure of mouse vallate taste buds: II. Cell types and cell lineage

The lifespan of cells in the mouse taste bud was examined with high‐voltage electron microscopic (HVEM) autoradiography (ARG) after giving a single injection of 3H‐thymidine. Animals were killed at 1 hour, 6 hours, 12 hours, 24 hours, and then daily up through 10 days postinjection. Lingual tissues were prepared for HVEM ARG so that we could identify and characterize labeled cells. Four categories of taste cells were identified: basal, dark, intermediate, and light cells. Basal cells were polygonal cells located near the basolateral sides of the taste buds and were characterized primarily by the presence of filaments attached to the nuclear envelope. Dark and light cells had the typical features described by previous authors. Intermediate cells had features in between those of dark and light cells.