Abstract
We have developed a procedure for the isolation of four different viable cell populations from the 14-day embryonic chick neural retina. Population I consists primarily (>80%) of cells which appear to be ganglion cells. Population IV consists primarily (>90%) of small cells which appear to originate from the bipolar layer. Populations II and III are mixtures of several cell types. Cells of each population were labeled with either rhodamine isothiocyanate or fluorescein isothiocynate, and mixed together under conditions which promote cell aggregation. The label allowed us to follow the fate of the different cell populations in mixtures. In all heterotypic mixtures, distinct cell sorting was observed. Controls indicated that the labeling procedure did not alter the behavior of the cells in vitro, and that homotypic mixtures did not sort out. These results suggest that an intercellular recognition system exists which permits the cells in the populations to discriminate among each other.
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