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Fig. 7. Alvinella pompejana embryos cultured at the ELSA hydrothermal vent site, positions I1, I2 and I3 (see Fig. 1). Incubators were deployed for 5 days before recovery by the submersible. U, uncleaved embryos; 2c, 2-cell stage; 4c, 4-cell stage; 8c, 8-cell stage; >8c, above 8-cell stage; D, degrading embryos.