Kimmel et al., 1955.
Developmental Dynamics 203:253-310. Copyright © 1995 Wiley-Liss, Inc.
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Fig. 3. The zygote period. A: The zygote within its uplifted chorion, a few minutes after fertilization. B. The dechorionated zygote with the animal pole to the top, about 10 min after fertilization. Yolk-free cytoplasm has begun to segregate to the animal pole. Scale bar: 250 µm.