Abstract
As part of a study of cell surface differentiation during chick retina development, a freeze-fracture study of neural retinas from 5 to 10 day embryonic chicks was undertaken. Three classes of changes have been detected. (1) As cells differentiate and become recognizable by their position within the tissue, they acquire characteristic numbers of intramembrane particles in the surfaces in each layer. (2) Small gap junctions appear between cells at the outer limiting membrane of the 5 day retina. At 6 days, they are larger, more numerous and are also found in deeper layers of the tissue. By the seventh day, the size and number of the junctions is greatly reduced; they are not visible after the tenth day. (3) The characteristic lack of particles in the outer limiting membrane of the mature retina appears at the ninth day of incubation, at the time that presumptive photoreceptors extend through the outer limiting membrane. Tight junctions between cells were not observed during this study.
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