Living organisms, the genome of which has been changed through genetic engineering operations and contains at least one actively functioning gene of another organism, are called transgenic.
One of the main methods for producing transgenic animals is the microinjection of DNA into fertilized eggs. This method from 1982 to the present time remains the most popular among researchers engaged in obtaining transgenic animals, despite the fact that it requires high qualification and expensive equipment. In recent years, embryonic stem cells obtained from embryos in the early stages of development are also used to create transgenic animals.
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