Figure 8. FluoSphere^® labeling in the tadpole eye. Four days prior, this living, free-swimming tadpole received a Cy3-FluoSpheres^® brain ventricle injection at stage 26. A: Macroscopically, there is no apparent distortion or malformation of the orbital structures. B: Under fluorescence, the label is restricted to the brain and retina. In the eye, the fluorescence emanates through the pupil (arrow). Although the right eye was equally labeled, its fluorescence is not visible, as its pupil is not in view.