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Fig. 5. CAB formation. (A,B) The CAB in extracted 8-cell embryo injected with control MO (A) and in embryo injected with POPK-1 MO (B). Bilateral CABs are indicated by white arrowheads. Animal views. (C,D) The CAB at the 4-cell stage. (C) Control MO. (D) POPK-1 MO. The CAB precursors are more scattered than control. (E,F) Closer views of A and C. White arrowheads indicate each CAB. Anterior is up. Scale bars: 25 µm.