Today's image is of an M-FISH experiment, (also called "chromosome painting") taken from here. I've been wanting to show a photo of this technique for several weeks, but it's taken me a while to find one that was of sufficient quality. This is a technique where the DNA from each chromosome is "stained" with a particular color, so that each chromosome is readily identified. In this particular image, you can see multiple colors on some of the chromosomes, indicating that these are fusions of multiple chromosomes. This is likely a chromosome spread from a tumor cell.