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1 Biology Department, Brandeis University, Waltham 54, Mass.
1. Isolated ectodermal fragments of Aurelia aurita scyphistomae regenerate into complete hydranths. Aurelia possesses no interstitial cells, but large amoeboid cells appear during reconstitution.
2. The endoderm forms by differentiation of the amoeboid cells, which have probably arisen by dedifferentiation of the ectoderm.
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