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  • Spleen 3 days after immunisation
  • Spleen 3 days after immunisation
  • Spleen 3 days after immunisation
  • Developing mouse embryo days 1-4
  • Mouse blastocyst 3.5 days after fertilisation
  • Contraceptive pill - pack showing days+ pill
  • Cat - rodent ulcer two days after freezing
  • Stomach, ten days after poisoning with sulphuric acid
  • Engraving: Growth of chick embryo at days 19-20, 1625.
  • Engraving: Growth of chick embryo at days 21-24, 1625.