STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Human embryo. Side view of a five-week-old human embryo seen within its amniotic sac. The umbilical cord which attaches it to its mother is visible. The retina of the eye (dark spot) has a lens and cornea formed in front of it. Ear swellings are present and the hands and feet have fingers and toes. The embryo at this age is about 10 milli- metres in length.
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