The XFM-2X Phantom Mouse is used for training and/or practice using IVIS optical imaging systems in fluorescence and/or x-ray mode. The outer material is made to mimic tissue properties so the user sees light scatter similar to what is seen in a live subject. The color of the surface of the phantom emulates the behavior of tissue background fluorescence (autofluorescence). The XFM-2 comes with various plastic rods containing different fluorescent dyes to simulate fluorescence imaging.