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A mast cell cutaway packed with detail, showing a round, textured nucleus at its center surrounded by dense rows of histamine granules. Each granule is a raised bead, scattered through the cytoplasm among looping folds, while the ruffled outer membrane rolls around the edge in soft waves. The relief shape shows the inside clearly from the front, making it a strong teaching model for an immunology lesson, a cell biology classroom or an allergy talk.

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