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1 Dept. of Zoology, University of Pennsylvania, Philadelphia 4, Pa., and the Dept. of Physiology and Biophysics, University of Vermont, Burlington, Vermont
1. Extracts from the ovaries of 14 different species of fishes all have an antimitotic effect on the eggs of the worm Chaetopterus.
2. Extracts from the ovaries of the frog, salamander, chicken, rabbit, dog, lamb, pig, and cow act in similar fashion.
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