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Abstract
Gigaseals were obtained from enzymatically dissociated epithelial cells of Hydra vulgaris, and resting potentials were recorded in the whole‐cell configuration. These results were obtained in spite of hard difficulties of applying patch‐clamp techniques in the whole‐cell configuration to Hydra cells. These difficulties are principally inherent to the fact that Hydra lives in a low ionic strength medium. It will be now possible to apply patch‐clamp techniques to the study of Hydra extraocular photoreception.