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Fig. 6. Alvinella pompejana embryos cultured at 2–20°C and 250 atm. Histograms show the frequency distribution of developmental stages achieved by at least 20 embryos sampled in the main culture. Embryos were observed after 24 h, 48 h, 72 h and 8 days of incubations. U, uncleaved embryos; 2c, 2-cell stage; 4c, 4-cell stage; 8c, 8-cell stage; ≥16c, 16-cell stage and more; D, degrading embryos.