Fig. 8. LM of a stage 2, 8-cell embryo on day 3 in vitro during the initial phase of compaction (compaction 1) called cell-cell contact. Blastomeres become closely opposed to one another and cell junctions begin to form between them.
(From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Taylor & Francis Group.)
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