LM of a stage 2 embryo on day 3 in vitro during moderate cell-cell contact (compaction 2). Cells can be easily counted.
From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Taylor & Francis Group.
Keywords: compaction, exterior part of blastomere cell membrane, moderate blastomere cell-cell contact, subzonal space, zona pellucida
Source: The Virtual Human Embryo.