With Lissamine's fast red stain, which component is stained yellow?

Lissamine's fast red stain is primarily used for staining connective tissue and highlights various components within histological sections. When using this stain, collagen specifically takes on a yellow coloration. This is due to the staining properties of the dye, which preferentially reacts with collagen fibers, allowing them to be distinctly visualized under a microscope.

In contrast, muscle, red blood cells, and nuclei would not be stained yellow by this method. Muscle tissue may show other colors depending on the staining protocol, red blood cells generally present in shades of red or pink due to hemoglobin content, and nuclei typically stain dark blue or purple with many commonly used dyes. Therefore, the identification of collagen as the component that is stained yellow by Lissamine's fast red highlight the utility of this stain in histopathology for differentiating tissue structures.