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Fig. 4. Alvinella pompejana embryos cultured at 2–27°C and 1
atm. Histograms show the frequency distribution of developmental stages
achieved by at least 20 embryos sampled in the main culture. Embryos were
observed 12 h, 24 h, 48 h and 72 h after fertilisation except in two cases: *
observation 16 h after fertilisation, and ** observation 63 h after
fertilisation. U, uncleaved embryos; 2c, 2-cell stage; 4c, 4-cell stage; 8c,
8-cell stage; 
16c, 16-cell stage and more; D, degrading embryos.
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