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Cells of Nitella exposed to distilled water lose their ability to produce action currents and to distinguish electrically between sodium and potassium. This ability was quickly restored by exposure to blood plasma deprived of calcium. Human blood and that of the cat, calf, and sheep gave essentially the same results.
The active agents appear to be organic substances.
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Copyright, 1936, by The Rockefeller Institute for Medical Research
1936
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