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Fig. 1. Clonal fate map of first-quartet micromeres (A) and origin of quadrant lineages (B) in the Ilyanassa embryo. (A) Eight-cell embryo and hatching-stage larva are seen from the animal pole with dorsal at the top; the different clonal territories are drawn schematically using the data of Render (Render, 1991). (B) First and second cleavages are shown in dorsal aspect with the animal pole (marked by polar bodies) at the top. PL, polar lobe.





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