Abstract
By means of the microinjection apparatus the series of acid dye indicators of Clark and Lub and the basic dye Neutral Red were injected both into the cytoplasm and into the nucleus of the immature starfish egg.
The color changes upon injection indicate the pH of the nucleus to be in the neighborhood of 7.6 to 7.8, whereas that of the living cytoplasm is 6.6 to 6.8, 1 and cytoplasm cytolyzed by mechanical injury is 5.4 to 5.6.
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