True or False: Methyl green-pyronin and Toluidine blue are used to demo connective tissue cells.

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

Answer: (A)

Stains that help reveal cellular and extracellular components in connective tissue make it possible to identify which cells are present and how the matrix is organized. Methyl green-pyronin splits staining of DNA and RNA: DNA binds methyl green and appears green, while RNA binds pyronin Y and appears pink/red. This contrast highlights cells in connective tissue, and helps distinguish cells with high RNA content (such as plasma cells) from others, making connective tissue cells more visible within the tissue.

Toluidine blue, a basic dye, binds acidic tissue components and can show metachromasia at the right pH. This makes mast cell granules turn a purple color and highlights sulfated glycosaminoglycans in cartilage and other connective tissue components. These features make toluidine blue useful for demonstrating connective tissue cells and their surrounding matrix.

Because each stain has meaningful utility in visualizing connective tissue cells, the statement is true.