Additional Source #18 – Book

“[An] embryo [is t]he early developing fertilized egg that is growing into another individual of the species. In man the term “embryo” is usually restricted to the period of development from fertilization until the end of the eighth week of pregnancy”¹⁸

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¹⁸Walters, W. & Singer, P. [Eds.], Test-Tube Babies, Melbourne: Oxford University Press, 1982, p. 160.