Fig. 4. LM of a polarized stage 1b embryo in vitro with pronuclear alignment along the polar axis (interrupted line) . The second polar body indicates the first cleavage plane and marks the polar axis until the blastocyst stage (stage 3). Pronuclei rotate into the polar axis.
(From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Taylor & Francis Group.)
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