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- supplemental material - Figure S1. RGC axon choice points in the accessory optic, pretectal, and retinothalamic/retinotectal systems. Axons of Brn3a-expressing RGCs and their target nuclei are shown in green, axons of all other RGCs are shown in red. Brn3a RGC axons remain in the principal optic tract innervating the dorsal lateral geniculate and superior colliculus, and do not innervate the accessory optic pathway or pretectal nuclei serving subcortical visual functions. 2n, optic nerve; aot, accessory optic tract (sf, superior fasciculus, if, inferior fasciculus); cp, cerebral peduncle; DLG, dorsal lateral geniculate; DT, dorsal terminal nucleus of the accessory optic tract; LT, lateral terminal nucleus of the accessory optic tract; MG, medial geniculate; MT, medial terminal nucleus of the accessory optic tract; opt, optic tract; OPT, olivary pretectal nucleus; OT, nucleus of the optic tract; ox, optic chiasm; SC, superior colliculus; SCN, suprachiasmatic nucleus; VLG, ventral lateral geniculate. Adapted from the work of Pak and co-authors, by permission (Pak et al., 1987).