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Chick EmbryoEmbryonic DevelopmentCiona IntestinalisSea UrchinElectron MicroscopeLens RegenerationEctodermal CellsGastrula StageCyclic NucleotidesEmbryonic CellsLactate DehydrogenaseAnuran AmphibianFine StructureMesenchyme CellsNeurula StageEmbryos and LarvaeXENOPUSBufo ViridisEgg MembraneHorseshoe Crab