Abstract
Human pituitaries fixed in Bouin's fluid or 10% formalin were stained by the PAS, Masson trichrome and luxol fast blue methods. By comparing adjacent sections stained by these 3 methods it was found that the alpha cells which are PAS negative, but stained red by the Masson trichrome method, were intensely stained by luxol fast blue. The beta cells which are stained blue by the PAS and Masson methods were not stained by luxol fast blue. Similar observations were made on a series of pituitaries from 8 other mammalian species. It is concluded that luxol fast blue is a selective stain for alpha cells in the mammalian pituitary.
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