AN ELECTRON MICROSCOPE STUDY OF THE ENDOPLASMIC RETICULUM IN NEWT NOTOCHORD CELLS AFTER DISTURBANCE WITH ULTRASONIC TREATMENT AND SUBSEQUENT REGENERATION.

Occasionally, a few vacuoles about 0.5 AM or less in diameter were found in the cytoplasm of cells after ultrasonic treatment, but these were not considered to be cavitation nuclei because they were not sur- rounded by zones of disordered ultrastructure. This was the only abnormality observed in treated notochord cells, apart from the abnormal ER. The appearance of the endoplasmic reticulum in material fixed at 3 and 24 hours after treat- ment showed a trend towards normality.

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