Kimmel et al., 1955.
Developmental Dynamics 203:253-310. Copyright © 1995 Wiley-Liss, Inc.
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Fig. 6. Diagrammatic animal polar views of the planes of the first 5 cleavages. The outer circle is the yolk, and the inner ellipse in A is the uncleaved blastodisc. B-F show successive cleavages, with odd numbered cleavages cutting the short axis of the blastodisc and even numbered ones cutting the long axis. From Kimmel et al. (1991).