A schematic diagram identifying the target dLGN layers harvested for microarray analysis (left). Contralateral and ipsilateral retinal ganglion cell axons originate from nasal and temporal retinal ganglion cells, respectively, and terminate in layers 1, 4, and 6 (contralateral) or 2, 3, and 5 (ipsilateral) of the dLGN, visualized here by Nissl staining. Axons terminating in outer (1 and 2) and inner (3–6) layers form the magnocellular and parvocellular visual streams, respectively. The S layers are indicated (arrow). Magnocellular and parvocellular layers after microdissection with tissue punches are shown by post hoc Nissl staining (right).