The distribution and ultrastructure of mast cells in the duck were studied. Carnoy's fluid was found to be the best fixative, and Padawer's method was found to be useful in demonstrating the metachromasia. Mast cells were seen in many of the organs and were most numerous in the proventriculus. Perivascular location was frequently seen. The ultrastructure resembled that of the chicken mast cell. The cell contained different types of membrane-bound granules, some of which were electron-dense and mottled.
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