Which reagent is used to stain fat in the Osmium Tetroxide procedure?

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Multiple Choice

Which reagent is used to stain fat in the Osmium Tetroxide procedure?

Explanation:
In this process, the reagent that stains fat is osmium tetroxide solution. Osmium tetroxide acts as both fixative and stain for lipids by reacting with the unsaturated bonds in fatty acids, depositing osmium and turning fats black so they become visible under light microscopy. This makes lipid-rich structures like cell membranes and myelin stand out after processing. The other reagents serve different purposes: periodic acid oxidizes carbohydrates for the PAS reaction, hematoxylin stains nuclei and provides general basophilic contrast, and toluidine blue is a general metachromatic stain for various tissue components but does not specifically stain fats in the osmium tetroxide procedure.

In this process, the reagent that stains fat is osmium tetroxide solution. Osmium tetroxide acts as both fixative and stain for lipids by reacting with the unsaturated bonds in fatty acids, depositing osmium and turning fats black so they become visible under light microscopy. This makes lipid-rich structures like cell membranes and myelin stand out after processing. The other reagents serve different purposes: periodic acid oxidizes carbohydrates for the PAS reaction, hematoxylin stains nuclei and provides general basophilic contrast, and toluidine blue is a general metachromatic stain for various tissue components but does not specifically stain fats in the osmium tetroxide procedure.

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