Abstract
Most lizards lay eggs. However viviparity has evolved in the Squamata on many separate occasions by the process of extended retention of the egg coincident with gradual loss of the eggshell. This process is linked to reduction of the amount of yolk which is coupled with development of placental nutrient transfer. The family Scincidae currently show a range of multiple independent origins of viviparity and placentation along this pathway, and the genus Mabuya shows one of the most structurally complex placentas. This study investigates the transport potential of the different areas of the Mabuya placenta using immunocytochemistry to localize the systems in place for calcium, glucose and water transfer. The localization of these transporters demonstrated restricted distributions in the specialized areas of this morphologically complex placenta.
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