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Fig. 4. Optimized in vitro conditions partially rescue the cytokinesis defect of
cyk-3 embryos. (a) In EGM, wild-type blastomeres can divide normally.
Cells of the P-lineage divide in a linear cleavage pattern (white arrow);
cells of the AB lineage divide in a spiral cleavage pattern (white arrowhead).
(b) cyk-3 mutant embryos under the same conditions frequently show
cleavage furrows (black arrowhead), indicating that cytokinesis is not a
primary defect.
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