Zona Pellucida Eutherian Mammal Acrosome Reaction Sperm Head Sperm Maturation 
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Mammals, grouped as such because of shared features that include hair, homeothermy, and lactation, are composed of Monotremata (Prototheria), and the Theria, which include Marsupialia (Metatheria), and Eutheria. The latter are often referred to as placental mammals, but this is inappropriate in the strict sense since marsupials also briefly develop a functional placenta.


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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • J. Michael Bedford
    • 1
  1. 1.Departments of Obstetrics and Gynecology and Cell Biology and AnatomyCornell University Medical CollegeNew YorkUSA

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