experiments based on the retrograde transport of horseradish peroxidase ( hrp ) from the eye indicate that the first centrifugal fibers , in the isthmo-optic tract ( iot ) , reach the retina on the 10 day of incubation , and by the 12th day all but about 5 % of the neurons in the ion can be retrogradely labeled in this way ...
C0015392
eye
C0035298
retina