A page shows three different fluorescene microscopic images with the following text:

• Viewing Labeled Specimens: In fluorescence microscopy, a specimen is labeled with a molecule that glows under a specific wavelength of light. Different fluorescent labels give off different colors. This way, biologists can easily see exactly where a protein is located within a cell or tissue.
• Normal Spindle: Different fluorescent labels enable biologists to track how spindle fibers (green) form and how proteins help distribute chromosomes (red) evenly during mitosis.
• Abnormal Spindle: Cell cycle control has gone awry in this cell, causing an abnormal mitotic spindle to form.