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The fluorescence stain is not primarily utilized for bacterial identification in the same fundamental way that the other stains are. Fluorescence staining is often employed to visualize specific components or structures within cells, such as nucleic acids or proteins, and can also be used to detect certain pathogens through labeled antibodies. However, its use is typically more specialized and is not a standard method specifically for identifying bacteria based on their morphology, structural characteristics, or physiological properties.

In contrast, the Gram stain is a fundamental technique that differentiates bacteria into Gram-positive and Gram-negative based on their cell wall structure. The endospore stain is used to identify bacterial spores, highlighting their presence among vegetative cells, while the capsule stain helps visualize the polysaccharide layers surrounding some bacteria. Each of these techniques provides critical information about bacterial identity and characteristics, making them widely employed in microbiological practices.