The auramine-rhodamine stain (AR), also known as the Truant auramine-rhodamine stain, is a histological technique used to visualize acid-fast bacilli using fluorescence microscopy, notably species in the Mycobacterium genus. Acid-fast organisms display a reddish-yellow fluorescence. Although the auramine-rhodamine stain is not as specific for acid-fast organisms as the Ziehl-Neelsen stain, it is more affordable and more sensitive, therefore it is often utilized as a screening tool.
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