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Fig. 4. (A) Post-fertilization loss of ER clusters in a DiI-loaded Cerebratulus sp. oocyte. (B) ER clusters that are present in mature oocytes of Cerebratulus lacteus before fertilization in 25 µM PD98059 (top) continue to be disassembled by 2 hours post-fertilization (bottom). Scale bars: 50 µm.