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Credit
Die Perigenesis der Plastidule oder die Wellenzeugung der Lebenstheilchen : ein Versuch zur mechanischen Erklärung der elementaren Entwickelungs-Vorgänge / von Ernst Haeckel. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.