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Credit
History of the development of the human ovum, with a comparative view of the development of the ova of mammalia and birds / translated and abridged from the German of Dr G. Valentin, of Breslau, by Martin Barry. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.