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Credit
The histology and histochemistry of man : a treatise on the elements of composition and structure of the human body / by Heinrich Frey ; translated from the fourth German edition by Arthur E. J. Barker and revised by the author. 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.