Kimmel et al., 1955.
Developmental Dynamics 203:253-310. Copyright © 1995 Wiley-Liss, Inc.
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Fig. 8. Face views of embryos during the blastula period. A: 256-cell stage (2.5 h). B: high stage (3.3 h). C. transition between the high and oblong stages (3.5 h). D. transition between the oblong and sphere stages (3.8 h). E: dome stage (4.3 h). F. 30%-epiboly stage (4.7 h). Scale bar: 250 µm.