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Polarization of the avian retina. Ocular transplantation studies

The optic fiber layer of the avian retina, as seen in flat mounts, contains morphological markers of vertical and horizontal polarity. Optic vesicles were rotated in chick embryos prior to the appearance of the optic fiber layer. Later, the optic fiber pattern was examined to determine if its polarity was inverted, or upright or if its right‐left asymmetry changed.