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Frog (Xenopus laevis)

Originating from South Africa, this frog is a common pet and lab animal used for genetic testing.


Xenopus laevis, also known as the African clawed frog, is a commonly used model organism in biological sciences. It has three claws on eat hind foot that give it its name. The frogs are tongueless and completely aquatic.

Xenopus embryos and eggs are used in a variety of biological studies, the oocytes being the primary system for ion transport studies. Xenopus egg extracts are used as in vitro systems for gene function and biochemistry studies. In the past, the clawed frog has even been used for pregnancy testing in humans. If a sample of urine from a woman is injected into the frog, the frog will produce eggs within 48 hours if the woman is pregnant.