Quantitative analysis of epithelial cell aggregation in the simple metazoan Hydra reveals a switch from homotypic to heterotypic cell interactions.

Abstract excerpt

Hydra, a member of the diploblastic phylum Cnidaria, exhibits the most basic type of organized metazoan tissues. Two unicellular sheets of polarized epithelial cells - ectoderm and endoderm - form a double layer throughout the body column. The double layer can be reestablished from single-cell suspensions by tissue-specific cell-sorting processes. However, the underlying pattern of interactions between ectodermal...

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