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Twins, illustration

Twins, illustration

C035/4681

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Credit

JACOPIN / BSIP / SCIENCE PHOTO LIBRARY JACOPIN / BSIP / SCIENCE PHOTO LIBRARY

Caption

Illustration of various types of uniovular gemellary pregnancies (true twins); these pregnancies result from a single egg and a single sperm, the fertilized egg divides. Depending on the date of division: Before 4 days: dichorionic pregnancy (2 placentas), diamniotic (two amniotic sacs). From 4 to 8 days: monochorionic pregnancy (1 placenta for 2 foetuses), diamniotic (two amniotic sacs). From 8 to 14 days: monochorionic pregnancy (1 placenta), monoamniotic (one amniotic sac). After 14 days: conjoined twins, 1 umbilical cord (Siamese).

Release details

Model release not required. Property release not required.

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