Scientists have published a new and improved genome sequence for mouse lemurs, tiny primates that sometimes develop Alzheimer's -like symptoms as they age, just like humans. In this kaleidoscopic matchup, the researchers compared 33 mouse lemur chromosomes with 22 human chromosomes. Colored ribbons connect regions of rough similarity. The dark blue ribbon, for example, indicates they found bits of mouse lemur chromosome 1 scattered throughout human chromosomes 3, 4 and 6. By comparing scrambled bits of chromosomes, researchers hope to figure out how the earliest primate genome was arranged, and better understand how Alzheimer’s and other diseases came to be in the primate family tree.