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The Endowment for Human Development
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End of Embryonic Period


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: Oito semanas marca o fim do período embriônico.

Durante este período, o embrião humano cresceu de uma única célula às quase 1 bilhão de células que formam mais de 4.000 estruturas anatômicas.

O embrião agora possui mais de 90% das estruturas encontradas em adultos.

All ages referenced to fertilization, not last menstrual period.
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