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  1. Coloured SEM of human embryo at 16-cell stage
  2. Coloured SEM of human embryo at 8-cell stage
  3. Coloured SEM of human embryo at the 4-cell stage
  4. LM of four-cell embryo
  5. Coloured SEM of a fertilized human egg (zygote)
  6. Coloured SEM of human embryo at the 2-cell stage