Methyl green-pyronin and Toluidine blue can be used to demo connective tissue cells.

• A. True
• B. False
• C. Only MG-P
• D. Only Toluidine Blue

Answer: (A)

Staining techniques that reveal different cellular components and the surrounding matrix are the key idea here. Methyl green-pyronin shows DNA and RNA in distinct colors, which helps identify and assess cells in connective tissue based on their transcriptional activity. Nuclei stain green because of DNA binding, while RNA-rich cytoplasm stains red. This contrast makes actively synthesizing cells, like plasma cells with prominent rough endoplasmic reticulum, stand out among connective tissue cells such as fibroblasts, providing a useful view of cellular activity within the tissue.

Toluidine blue is a basic dye that binds acidic components of the tissue and can reveal the connective tissue matrix nicely. It also exhibits metachromasia, so certain structures like mast cell granules appear a different color (often purple) from the surrounding blue-stained tissue. This helps visualize both the connective tissue framework and the specific cell types embedded in it.

Because each stain highlights different aspects of connective tissue—MG-P emphasizing cellular nucleic acids and activity, Toluidine blue emphasizing matrix components and metachromatic cell features—both can be used to demonstrate connective tissue cells.