Genus for Africans frogs that known as African clawed frogs is Xenopus. Two species falls in this genus are known as Xenopus laevis and Xenopus tropicalis but Xenopus laevis is more popular among the scientists and biologists to be a models for research purposes because of many advantages can be get from Xenopus laevis. Xenopus laevis widely uses as one of the animal models to study the development and embryology, molecular and cell biology, the genome of the Xenopus laevis, and disease related to human. The genome size of the Xenopus laevis is about 3.1 x109 bp. The life time of the Xenopus sp. is quite longer approximately 2 years and makes the Xenopus laevis the best choice for research studies. Besides, the Xenopus laevis is fully aquatic,…show more content… The Xenopus laevis also give the scientist to understand on how they can regulate and interact with environmental stress and aging during the embryonic development and study on how the diseases and the cells defects can occur during the embryo formation. The eggs and embryos of the Xenopus sp. are very important on experimental and research purposes. There are several aspects why Xenopus laevis eggs and embryos an important tools for scientist. The features or aspects are the embryo can be manipulated widely for example tissue transplantations, the whole embryo or other cell of the Xenopus sp. can be injected with many materials such as DNA and proteins, the gene knock-out and other studies can be conducted because cell fate of each embryonic cell is well known, eggs and embryos have the high nutrient and source for biochemical studies, the cell from Xenopus sp. oocytes can be used for basic studies of cell and molecular biology study, ion transport and channel physiology study, and used for environmental toxicology and the genetic information of the Xenopus