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. 2011 Sep 20;2:18. doi: 10.1186/2041-9139-2-18

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Copyright ©2011 Schulze and Schierenberg; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Cleavage and polarity. Early cleavage patterns in 12 nematode species (a-l) and the tardigrade Hybsibius dujardini (r). In addition, single images of selected nematode embryos are shown (m-q). Representatives are ordered according to clades (right margin). On the left margin the type of early cleavage, stage when visible polarity is established (PE) and polarity reversal in the germline (PR) are indicated where applicable. Position and action of POCs deduced from cell behavior are marked. Green dot, primary POC acting on two adjacent cells; green arrowhead, primary POC acting on P1 only; purple dot, secondary POC acting on two adjacent cells; yellow arrowhead, tertiary POC, acting on germline cells; open red arrowhead, orientation of cleavage spindle; black bars connect sister cells. Figure 2r was taken from [48] with permission from Elsevier; Figure 2q was taken from [67].