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Placenta and embryo at about 11 4 ⁄ 7 wk gestation.

Placenta and embryo at about 11 <sup >4</sup>⁄<sub>7</sub> wk gestation.
Placenta and embryo at about 11 <sup >4</sup>⁄<sub>7</sub> wk gestation.

The embryo measures 4.2 cm.