Abstract
An unusual structure has been noted within dark cells of taste buds from young rats. It appears most prominently in 10-day-old rats, at a time when the taste bud is almost fully differentiated. The structure consists of dense, irregularly shaped particles, 250–350 Å in size, associated with the outer membrane of the nuclear envelope. These particles are well demonstrated in sections stained with uranyl acetate alone, as well as in those treated with solutions containing lead salts. For this and other reasons it is suggested that the particles contain ribonucleoprotein. Their appearance is thought to be an expression of a stage of cytodifferentiation in taste bud dark cells.
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