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HA4: Tongue, Mallory's iron hematoxylin
This unusual stain gives an excellent view of the taste buds (tb) and the nerve bundles (arrows) that supply them (HA4). The point of entry of nerves is at the base of the taste buds. In a few places, the taste pores (arrowheads) are visible. There is more than one cell type in each taste bud (some cells stain darker than others).