| 31. | Even non-placental eutherians probably reproduced this way.
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| 32. | Genetic analysis suggests a divergence date between the marsupials and the placentals at.
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| 33. | However, no existing ( or extant ) placental mammal has this number.
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| 34. | The interclavicle is absent in marsupials and placental mammals.
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| 35. | These cells differentiate into many placental cells types, including extravillous trophoblast cells.
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| 36. | It has been shown to occur naturally only in birds and placental mammals.
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| 37. | Hydatidiform moles are abnormal conceptions with excessive placental development.
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| 38. | In the Western world, maternal deaths due to placental abruption are rare.
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| 39. | Placental abruption is often associated with uterine bleeding as well as uterine pain.
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| 40. | Placental vessels have also been blocked by angiographic embolization.
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