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Fig. 4. Onset of Ras 12V37G induced actin disruption after the midblastula transition. (A,C,E) Uninjected control embryos, (B,D,F) embryos injected in the animal hemisphere with Ras 12V37G mRNA (500 pg/blastomeres). Cortical actin was analysed at the 500-cell stage (A-B), the 2000-cell stage (C-D), and the MBT (E-F).